--- a/Makefile.in
+++ b/Makefile.in
@@ -129,24 +129,20 @@ endif
 include $(topsrcdir)/config/rules.mk
 
 distclean::
 	cat unallmakefiles | $(XARGS) rm -f
 	rm -f unallmakefiles $(DIST_GARBAGE)
 
 ifeq ($(OS_ARCH),WINNT)
 # we want to copy PDB files on Windows
-MAKE_SYM_STORE_ARGS := -c
+MAKE_SYM_STORE_ARGS := -c --vcs-info
 ifdef PDBSTR_PATH
 MAKE_SYM_STORE_ARGS += -i
 endif
-ifeq (,$(CYGWIN_WRAPPER))
-# this doesn't work with Cygwin Python
-MAKE_SYM_STORE_ARGS += --vcs-info
-endif
 DUMP_SYMS_BIN ?= $(topsrcdir)/toolkit/crashreporter/tools/win32/dump_syms_vc$(_MSC_VER).exe
 # PDB files don't get moved to dist, so we need to scan the whole objdir
 MAKE_SYM_STORE_PATH := .
 endif
 ifeq ($(OS_ARCH),Darwin)
 # need to pass arch flags for universal builds
 ifdef UNIVERSAL_BINARY
 MAKE_SYM_STORE_ARGS := -c -a "i386 x86_64" --vcs-info

deleted file mode 100755
--- a/build/cygwin-wrapper
+++ /dev/null
@@ -1,75 +0,0 @@
-#!/bin/sh
-#
-# Stupid wrapper to avoid win32 dospath/cygdrive issues
-# Try not to spawn programs from within this file. If the stuff in here looks royally 
-# confusing, see bug: http://bugzilla.mozilla.org/show_bug.cgi?id=206643
-# and look at the older versions of this file that are easier to read, but
-# do basically the same thing
-#
-
-prog=$1
-shift
-if test -z "$prog"; then
-    exit 0
-fi
-
-# If $CYGDRIVE_MOUNT was not set in configure, give $mountpoint the results of mount -p
-mountpoint=$CYGDRIVE_MOUNT
-if test -z "$mountpoint"; then
-    mountpoint=`mount -p`
-    if test -z "$mountpoint"; then
-       print "Cannot determine cygwin mount points. Exiting"
-       exit 1
-    fi
-fi
-
-# Delete everything but "/cygdrive" (or other mountpoint) from mount=`mount -p`
-mountpoint=${mountpoint#*/}
-mountpoint=/${mountpoint%%[!A-Za-z0-9_]*}
-mountpoint=${mountpoint%/}
-
-args=""
-up=""
-if test "${prog}" = "-up"; then
-    up=1
-    prog=${1}
-    shift
-fi
-
-process=1
-
-# Convert the mountpoint in parameters to Win32 filenames
-# For instance: /cygdrive/c/foo -> c:/foo
-for i in "${@}"
-do
-    if test "${i}" = "-wrap"; then
-        process=1
-    else
-        if test "${i}" = "-nowrap"; then
-            process=
-        else
-            if test -n "${process}"; then
-                if test -n "${up}"; then
-                    pathname=${i#-I[a-zA-Z]:/}
-                    if ! test "${pathname}" = "${i}"; then
-                        no_i=${i#-I}
-                        driveletter=${no_i%%:*}
-                        i=-I${mountpoint}/${driveletter}/${pathname}
-                    fi
-                else
-                    eval 'leader=${i%%'${mountpoint}'/[a-zA-Z]/*}'
-                    if ! test "${leader}" = "${i}"; then
-                        eval 'pathname=${i#'${leader}${mountpoint}'/[a-zA-Z]/}'
-                        eval 'no_mountpoint=${i#'${leader}${mountpoint}'/}'
-                        driveletter=${no_mountpoint%%/*}
-                        i=${leader}${driveletter}:/${pathname}
-                    fi
-                fi
-            fi
-
-            args="${args} ${i}"
-        fi
-    fi
-done
-
-exec $prog $args

--- a/config/autoconf.mk.in
+++ b/config/autoconf.mk.in
@@ -328,19 +328,16 @@ XLDFLAGS	= @XLDFLAGS@
 XLIBS		= @XLIBS@
 XEXT_LIBS	= @XEXT_LIBS@
 XCOMPOSITE_LIBS	= @XCOMPOSITE_LIBS@
 XSS_LIBS	= @XSS_LIBS@
 
 MOZ_THUMB2	= @MOZ_THUMB2@
 
 WIN_TOP_SRC	= @WIN_TOP_SRC@
-CYGWIN_WRAPPER	= @CYGWIN_WRAPPER@
-AS_PERL         = @AS_PERL@
-CYGDRIVE_MOUNT	= @CYGDRIVE_MOUNT@
 AR		= @AR@
 AR_FLAGS	= @AR_FLAGS@
 AR_EXTRACT	= @AR_EXTRACT@
 AR_LIST		= @AR_LIST@
 AR_DELETE	= @AR_DELETE@
 AS		= @AS@
 ASFLAGS		= @ASFLAGS@
 AS_DASH_C_FLAG	= @AS_DASH_C_FLAG@

--- a/config/config.mk
+++ b/config/config.mk
@@ -444,26 +444,26 @@ endif
 # Personal makefile customizations go in these optional make include files.
 #
 MY_CONFIG	:= $(DEPTH)/config/myconfig.mk
 MY_RULES	:= $(DEPTH)/config/myrules.mk
 
 #
 # Default command macros; can be overridden in <arch>.mk.
 #
-CCC		= $(CXX)
-NFSPWD		= $(CONFIG_TOOLS)/nfspwd
-PURIFY		= purify $(PURIFYOPTIONS)
-QUANTIFY	= quantify $(QUANTIFYOPTIONS)
+CCC = $(CXX)
+NFSPWD = $(CONFIG_TOOLS)/nfspwd
+PURIFY = purify $(PURIFYOPTIONS)
+QUANTIFY = quantify $(QUANTIFYOPTIONS)
 ifdef CROSS_COMPILE
-XPIDL_COMPILE 	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/host/bin/host_xpidl$(HOST_BIN_SUFFIX)
-XPIDL_LINK	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/host/bin/host_xpt_link$(HOST_BIN_SUFFIX)
+XPIDL_COMPILE = $(LIBXUL_DIST)/host/bin/host_xpidl$(HOST_BIN_SUFFIX)
+XPIDL_LINK = $(LIBXUL_DIST)/host/bin/host_xpt_link$(HOST_BIN_SUFFIX)
 else
-XPIDL_COMPILE 	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/bin/xpidl$(BIN_SUFFIX)
-XPIDL_LINK	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/bin/xpt_link$(BIN_SUFFIX)
+XPIDL_COMPILE = $(LIBXUL_DIST)/bin/xpidl$(BIN_SUFFIX)
+XPIDL_LINK = $(LIBXUL_DIST)/bin/xpt_link$(BIN_SUFFIX)
 endif
 
 # Java macros
 JAVA_GEN_DIR  = _javagen
 JAVA_DIST_DIR = $(DEPTH)/$(JAVA_GEN_DIR)
 JAVA_IFACES_PKG_NAME = org/mozilla/interfaces
 
 INCLUDES = \
@@ -670,21 +670,21 @@ ifeq (1,$(HAS_XCODE_2_1))
 XCODE_PRODUCT_DIR = build/$(BUILDSTYLE)
 else
 XCODE_PRODUCT_DIR = build
 endif # HAS_XCODE_2_1=1
 endif # OS_ARCH=Darwin
 
 
 ifdef MOZ_NATIVE_MAKEDEPEND
-MKDEPEND_DIR	=
-MKDEPEND	= $(CYGWIN_WRAPPER) $(MOZ_NATIVE_MAKEDEPEND)
+MKDEPEND_DIR =
+MKDEPEND = $(MOZ_NATIVE_MAKEDEPEND)
 else
-MKDEPEND_DIR	= $(CONFIG_TOOLS)/mkdepend
-MKDEPEND	= $(CYGWIN_WRAPPER) $(MKDEPEND_DIR)/mkdepend$(BIN_SUFFIX)
+MKDEPEND_DIR = $(CONFIG_TOOLS)/mkdepend
+MKDEPEND = $(MKDEPEND_DIR)/mkdepend$(BIN_SUFFIX)
 endif
 
 # Set link flags according to whether we want a console.
 ifdef MOZ_WINCONSOLE
 ifeq ($(MOZ_WINCONSOLE),1)
 ifeq ($(OS_ARCH),OS2)
 BIN_FLAGS	+= -Zlinker -PM:VIO
 endif
@@ -738,22 +738,22 @@ GARBAGE		+= $(DEPENDENCIES) $(MKDEPENDEN
 ifeq ($(OS_ARCH),Darwin)
 ifndef NSDISTMODE
 NSDISTMODE=absolute_symlink
 endif
 PWD := $(CURDIR)
 endif
 
 ifdef NSINSTALL_BIN
-NSINSTALL	= $(CYGWIN_WRAPPER) $(NSINSTALL_BIN)
+NSINSTALL = $(NSINSTALL_BIN)
 else
 ifeq (OS2,$(CROSS_COMPILE)$(OS_ARCH))
-NSINSTALL	= $(MOZ_TOOLS_DIR)/nsinstall
+NSINSTALL = $(MOZ_TOOLS_DIR)/nsinstall
 else
-NSINSTALL	= $(CONFIG_TOOLS)/nsinstall$(HOST_BIN_SUFFIX)
+NSINSTALL = $(CONFIG_TOOLS)/nsinstall$(HOST_BIN_SUFFIX)
 endif # OS2
 endif # NSINSTALL_BIN
 
 
 ifeq (,$(CROSS_COMPILE)$(filter-out WINNT OS2, $(OS_ARCH)))
 INSTALL		= $(NSINSTALL)
 else
 ifeq ($(NSDISTMODE),copy)
@@ -772,22 +772,16 @@ else
 INSTALL		= $(NSINSTALL) -R
 endif # absolute_symlink
 endif # copy
 endif # WINNT/OS2
 
 # Use nsinstall in copy mode to install files on the system
 SYSINSTALL	= $(NSINSTALL) -t
 
-ifeq ($(OS_ARCH),WINNT)
-ifneq (,$(CYGDRIVE_MOUNT))
-export CYGDRIVE_MOUNT
-endif
-endif
-
 #
 # Localization build automation
 #
 
 # Because you might wish to "make locales AB_CD=ab-CD", we don't hardcode
 # MOZ_UI_LOCALE directly, but use an intermediate variable that can be
 # overridden by the command line. (Besides, AB_CD is prettier).
 AB_CD = $(MOZ_UI_LOCALE)

--- a/config/rules.mk
+++ b/config/rules.mk
@@ -1548,32 +1548,27 @@ ifneq (,$(filter OS2 WINNT WINCE,$(OS_AR
 SEP := ;
 else
 SEP := :
 endif
 
 EMPTY :=
 SPACE := $(EMPTY) $(EMPTY)
 
-# Cygwin and MSYS have their own special path form, but javac expects the source
-# and class paths to be in the DOS form (i.e. e:/builds/...).  This function
-# does the appropriate conversion on Windows, but is a noop on other systems.
+# MSYS has its own special path form, but javac expects the source and class
+# paths to be in the DOS form (i.e. e:/builds/...).  This function does the
+# appropriate conversion on Windows, but is a noop on other systems.
 ifeq (,$(filter-out WINNT WINCE, $(HOST_OS_ARCH)))
-ifdef CYGWIN_WRAPPER
-normalizepath = $(foreach p,$(1),$(shell cygpath -m $(p)))
-else
-# assume MSYS
 #  We use 'pwd -W' to get DOS form of the path.  However, since the given path
 #  could be a file or a non-existent path, we cannot call 'pwd -W' directly
 #  on the path.  Instead, we extract the root path (i.e. "c:/"), call 'pwd -W'
 #  on it, then merge with the rest of the path.
 root-path = $(shell echo $(1) | sed -e "s|\(/[^/]*\)/\?\(.*\)|\1|")
 non-root-path = $(shell echo $(1) | sed -e "s|\(/[^/]*\)/\?\(.*\)|\2|")
 normalizepath = $(foreach p,$(1),$(if $(filter /%,$(1)),$(patsubst %/,%,$(shell cd $(call root-path,$(1)) && pwd -W))/$(call non-root-path,$(1)),$(1)))
-endif
 else
 normalizepath = $(1)
 endif
 
 _srcdir = $(call normalizepath,$(srcdir))
 ifdef JAVA_SOURCEPATH
 SP = $(subst $(SPACE),$(SEP),$(call normalizepath,$(strip $(JAVA_SOURCEPATH))))
 _JAVA_SOURCEPATH = ".$(SEP)$(_srcdir)$(SEP)$(SP)"
@@ -1588,43 +1583,37 @@ else
 _JAVA_CLASSPATH = .
 endif
 
 _JAVA_DIR = _java
 $(_JAVA_DIR)::
 	$(NSINSTALL) -D $@
 
 $(_JAVA_DIR)/%.class: %.java $(GLOBAL_DEPS) $(_JAVA_DIR)
-	$(CYGWIN_WRAPPER) $(JAVAC) $(JAVAC_FLAGS) -classpath $(_JAVA_CLASSPATH) \
+	$(JAVAC) $(JAVAC_FLAGS) -classpath $(_JAVA_CLASSPATH) \
 			-sourcepath $(_JAVA_SOURCEPATH) -d $(_JAVA_DIR) $(_VPATH_SRCS)
 
 $(JAVA_LIBRARY): $(addprefix $(_JAVA_DIR)/,$(JAVA_SRCS:.java=.class)) $(GLOBAL_DEPS)
 	$(JAR) cf $@ -C $(_JAVA_DIR) .
 
 GARBAGE_DIRS += $(_JAVA_DIR)
 
 ###############################################################################
 # Update Makefiles
 ###############################################################################
 
-# In GNU make 3.80, makefiles must use the /cygdrive syntax, even if we're
-# processing them with AS perl. See bug 232003
-ifdef AS_PERL
-CYGWIN_TOPSRCDIR = -nowrap -p $(topsrcdir) -wrap
-endif
-
 # Note: Passing depth to make-makefile is optional.
 #       It saves the script some work, though.
 Makefile: Makefile.in
-	@$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH) $(CYGWIN_TOPSRCDIR)
+	@$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH)
 
 ifdef SUBMAKEFILES
 # VPATH does not work on some machines in this case, so add $(srcdir)
 $(SUBMAKEFILES): % : $(srcdir)/%.in
-	$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH) $(CYGWIN_TOPSRCDIR) $@
+	$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH) $@
 endif
 
 ifdef AUTOUPDATE_CONFIGURE
 $(topsrcdir)/configure: $(topsrcdir)/configure.in
 	(cd $(topsrcdir) && $(AUTOCONF)) && (cd $(DEPTH) && ./config.status --recheck)
 endif
 
 ###############################################################################

--- a/configure.in
+++ b/configure.in
@@ -180,17 +180,17 @@ then
   fi
 fi
 MOZ_BUILD_ROOT=`pwd`
 
 dnl Default to MSVC for win32 and gcc-4.2 for darwin
 dnl ==============================================================
 if test -z "$CROSS_COMPILE"; then
 case "$target" in
-*-cygwin*|*-mingw*|*-msvc*|*-mks*)
+*-mingw*)
     if test -z "$CC"; then CC=cl; fi
     if test -z "$CXX"; then CXX=cl; fi
     if test -z "$CPP"; then CPP="cl -E -nologo"; fi
     if test -z "$CXXCPP"; then CXXCPP="cl -TP -E -nologo"; ac_cv_prog_CXXCPP="$CXXCPP"; fi
     if test -z "$LD"; then LD=link; fi
     if test -z "$AS"; then
         case "${target_cpu}" in
         i*86)
@@ -608,17 +608,17 @@ esac
 if test -n "$COMPILE_ENVIRONMENT"; then
 if test "$MOZ_WINSDK_TARGETVER" -lt "06000000"; then
     # We can't build parental controls either
     MOZ_DISABLE_PARENTAL_CONTROLS=1
 fi
 fi
 
 case "$target" in
-*-cygwin*|*-mingw*|*-msvc*|*-mks*|*-wince|*-winmo)
+*-mingw*|*-wince|*-winmo)
     if test "$GCC" != "yes"; then
         # Check to see if we are really running in a msvc environemnt
         _WIN32_MSVC=1
         AC_CHECK_PROGS(MIDL, midl)
 
         # Make sure compilers are valid
         CFLAGS="$CFLAGS -TC -nologo"
         CXXFLAGS="$CXXFLAGS -TP -nologo"
@@ -1170,17 +1170,17 @@ fi # COMPILE_ENVIRONMENT
 
 if test -n "$MAKE"; then
   if test `echo $MAKE | grep -c make.py` != 1; then
      NOT_PYMAKE=$MAKE
   fi
 fi
 
 case "$host_os" in
-cygwin*|mingw*|mks*|msvc*)
+mingw*)
     MOZ_PATH_PROGS(GMAKE, $GMAKE $NOT_PYMAKE make gmake, :)
     ;;
 *)
     MOZ_PATH_PROGS(GMAKE, $GMAKE $NOT_PYMAKE gmake make, :)
     ;;
 esac
 if test "$GMAKE" = ":"; then
    AC_MSG_ERROR([GNU make not found])
@@ -1208,17 +1208,16 @@ DLL_PREFIX=lib
 LIB_PREFIX=lib
 DLL_SUFFIX=.so
 OBJ_SUFFIX=o
 LIB_SUFFIX=a
 ASM_SUFFIX=s
 IMPORT_LIB_SUFFIX=
 TARGET_MD_ARCH=unix
 DIRENT_INO=d_ino
-CYGWIN_WRAPPER=
 WIN_TOP_SRC=
 MOZ_USER_DIR=".mozilla"
 
 MOZ_JPEG_CFLAGS=
 MOZ_JPEG_LIBS='$(call EXPAND_LIBNAME_PATH,mozjpeg,$(DEPTH)/jpeg)'
 MOZ_ZLIB_CFLAGS=
 MOZ_ZLIB_LIBS='$(call EXPAND_LIBNAME_PATH,mozz,$(DEPTH)/modules/zlib/src)'
 MOZ_BZ2_CFLAGS=
@@ -1289,17 +1288,17 @@ HOST_OS_ARCH=`echo $host_os | sed -e 's|
 # OS_ARCH
 # OS_TEST
 # OS_TARGET
 # OS_RELEASE
 # OS_MINOR_RELEASE
 #
 
 case "$HOST_OS_ARCH" in
-cygwin*|mingw*|mks*|msvc*)
+mingw*)
     HOST_OS_ARCH=WINNT
     ;;
 darwin*)
     HOST_OS_ARCH=Darwin
     ;;
 linux*)
     HOST_OS_ARCH=Linux
     ;;
@@ -1382,23 +1381,18 @@ Windows_NT)
     OS_ARCH=WINNT
     OS_TARGET=WINNT
     OS_MINOR_RELEASE=`uname -v`
     if test "$OS_MINOR_RELEASE" = "00"; then
         OS_MINOR_RELEASE=0
     fi
     OS_RELEASE="${OS_RELEASE}.${OS_MINOR_RELEASE}"
     ;;
-CYGWIN32_NT|CYGWIN_NT*|MINGW*_NT*)
+MINGW*_NT*)
 #
-# If uname -s returns "CYGWIN_NT-4.0", we assume that we are using
-# the uname.exe in the Cygwin tools.
-# Prior to the Beta 20 release, Cygwin was called GNU-Win32.
-# If uname -s returns "CYGWIN32/NT", we assume that we are using
-# the uname.exe in the GNU-Win32 tools.
 # If uname -s returns MINGW32_NT-5.1, we assume that we are using
 # the uname.exe in the MSYS tools.
 #
     OS_RELEASE=`expr $OS_ARCH : '.*NT-\(.*\)'`
     OS_ARCH=WINNT
     OS_TARGET=WINNT
     ;;
 AIX)
@@ -1848,49 +1842,33 @@ dnl System overrides of the defaults for
 dnl ========================================================
 case "$host" in
 *-beos*)
     HOST_CFLAGS="$HOST_CFLAGS -DXP_BEOS -DBeOS -DBEOS -D_POSIX_SOURCE -DNO_X11"
     HOST_NSPR_MDCPUCFG='\"md/_beos.cfg\"'
     HOST_OPTIMIZE_FLAGS="${HOST_OPTIMIZE_FLAGS=-O3}"
     ;;
 
-*cygwin*|*mingw*|*mks*|*msvc*|*wince|*winmo)
+*mingw*|*wince|*winmo)
     if test -n "$_WIN32_MSVC"; then
         HOST_AR=lib
         HOST_AR_FLAGS='-NOLOGO -OUT:"$@"'
         HOST_CFLAGS="$HOST_CFLAGS -TC -nologo -Fd\$(HOST_PDBFILE)"
         HOST_RANLIB='echo ranlib'
     else
         HOST_CFLAGS="$HOST_CFLAGS -mno-cygwin"
     fi
     HOST_CFLAGS="$HOST_CFLAGS -DXP_WIN32 -DXP_WIN -DWIN32 -D_WIN32 -DNO_X11"
     HOST_NSPR_MDCPUCFG='\"md/_winnt.cfg\"'
     HOST_OPTIMIZE_FLAGS="${HOST_OPTIMIZE_FLAGS=-O2}"
     HOST_BIN_SUFFIX=.exe
     case "$host" in
     *mingw*)
-    dnl MinGW/MSYS does not need CYGWIN_WRAPPER
         PERL="/bin/sh ${_topsrcdir}/build/msys-perl-wrapper"
         ;;
-    *)
-        CYGWIN_WRAPPER="${srcdir}/build/cygwin-wrapper"
-        if test "`echo ${srcdir} | grep -c ^/ 2>/dev/null`" = 0; then
-            _pwd=`pwd`
-            CYGWIN_WRAPPER="${_pwd}/${srcdir}/build/cygwin-wrapper"
-        fi
-        if test "`${PERL} -v | grep -c cygwin  2>/dev/null`" = 0; then
-            AS_PERL=1
-            PERL="${CYGWIN_WRAPPER} $PERL"
-        fi
-
-        if test "`${PYTHON} -c 'import sys; print sys.platform;'`" != "cygwin"; then
-            PYTHON="${CYGWIN_WRAPPER} $PYTHON"
-        fi
-        ;;
     esac
 
     case "${host_cpu}" in
     x86_64)
         HOST_CFLAGS="$HOST_CFLAGS -D_AMD64_"
         ;;
     esac
     ;;
@@ -2334,18 +2312,17 @@ ia64*-hpux*)
     # Sanity check for WINCE_WINDOWS_MOBILE
     # XXX disabled until we can fix the mobile tinderbox
     ##if test "$WINCE_WINDOWS_MOBILE"; then
     ##   AC_CHECK_HEADER(tpcshell.h, [],
     ##        AC_MSG_ERROR([Can't find tpcshell.h in your SDK; are you sure you don't need --disable-windows-mobile-components?]))
     ##fi
 ;;
 
-
-*-mingw*|*-cygwin*|*-msvc*|*-mks*)
+*-mingw*)
     DSO_CFLAGS=
     DSO_PIC_CFLAGS=
     DLL_SUFFIX=.dll
     RC=rc.exe
     # certain versions of cygwin's makedepend barf on the 
     # #include <string> vs -I./dist/include/string issue so don't use it
     SYSTEM_MAKEDEPEND=
     if test -n "$GNU_CC"; then
@@ -2459,57 +2436,44 @@ ia64*-hpux*)
 
     dnl Hardcode to win95 for now - cls
     TARGET_NSPR_MDCPUCFG='\"md/_win95.cfg\"'
 
     dnl set NO_X11 defines here as the general check is skipped on win32
     no_x=yes
     AC_DEFINE(NO_X11)
 
-    dnl MinGW/MSYS doesn't provide or need cygpath
+    case "$host" in
+    *-mingw*)
+        MOZ_BUILD_ROOT=`cd $MOZ_BUILD_ROOT && pwd -W`
+        ;;
+    esac
+
     case "$host" in
     *-mingw*)
-	CYGPATH_W=echo
-	CYGPATH_S=cat
-	MOZ_BUILD_ROOT=`cd $MOZ_BUILD_ROOT && pwd -W`
-	;;
-    *-cygwin*|*-msvc*|*-mks*)
-	CYGPATH_W="cygpath -a -w"
-	CYGPATH_S="sed -e s|\\\\|/|g"
-	MOZ_BUILD_ROOT=`$CYGPATH_W $MOZ_BUILD_ROOT | $CYGPATH_S`
-	;;
-    esac
-    case "$host" in
-    *-mingw*|*-cygwin*|*-msvc*|*-mks*)
-
-    if test -z "$MOZ_TOOLS"; then
-        AC_MSG_ERROR([MOZ_TOOLS is not set])
-    fi
-
-    MOZ_TOOLS_DIR=`cd $MOZ_TOOLS && pwd -W`
-    if test "$?" != "0" -o -z "$MOZ_TOOLS_DIR"; then
-        AC_MSG_ERROR([cd \$MOZ_TOOLS failed. MOZ_TOOLS ==? $MOZ_TOOLS])
-    fi
-    MOZ_TOOLS_BIN_DIR="$(cd "$MOZ_TOOLS_DIR/bin" && pwd)"
-    if test `echo ${PATH}: | grep -ic "$MOZ_TOOLS_BINDIR:"` = 0; then
-        AC_MSG_ERROR([\$MOZ_TOOLS\\bin must be in your path.])
-    fi
-    MOZ_TOOLS_DIR=`$CYGPATH_W $MOZ_TOOLS_DIR | $CYGPATH_S`
-    ;;
+        if test -z "$MOZ_TOOLS"; then
+            AC_MSG_ERROR([MOZ_TOOLS is not set])
+        fi
+        MOZ_TOOLS_DIR=`cd $MOZ_TOOLS && pwd -W`
+        if test "$?" != "0" -o -z "$MOZ_TOOLS_DIR"; then
+            AC_MSG_ERROR([cd \$MOZ_TOOLS failed. MOZ_TOOLS ==? $MOZ_TOOLS])
+        fi
+        MOZ_TOOLS_BIN_DIR="$(cd "$MOZ_TOOLS_DIR/bin" && pwd)"
+        if test `echo ${PATH}: | grep -ic "$MOZ_TOOLS_BINDIR:"` = 0; then
+            AC_MSG_ERROR([\$MOZ_TOOLS\\bin must be in your path.])
+        fi
+        ;;
     esac 
 
-
     case "$host_os" in
     cygwin*|msvc*|mks*)
-        AC_MSG_WARN([Using a cygwin build environment is unsupported. Configure cannot check for the presence of necessary headers. Please upgrade to MozillaBuild; see https://developer.mozilla.org/en/Windows_Build_Prerequisites.])
+        AC_MSG_ERROR([Using a Cygwin build environment is unsupported. Configure cannot check for presence of necessary headers. Please upgrade to MozillaBuild; see https://developer.mozilla.org/en/Windows_Build_Prerequisites.])
         ;;
-
     *)
         AC_CHECK_HEADERS(oleacc.idl)
-
         AC_LANG_SAVE
         AC_LANG_CPLUSPLUS
         AC_CHECK_HEADERS(atlbase.h)
         AC_LANG_RESTORE
         ;;
     esac
 
     case "$target" in
@@ -2885,17 +2849,17 @@ case "$target" in
     NO_LD_ARCHIVE_FLAGS=
     ;;
 *-aix4.3*|*-aix5*)
     NO_LD_ARCHIVE_FLAGS=
     ;;
 *-openvms*)
     NO_LD_ARCHIVE_FLAGS=
     ;;
-*-msvc*|*-mks*|*-mingw*|*-cygwin*|*-wince|*-winmo)
+*-mingw*|*-wince|*-winmo)
     if test -z "$GNU_CC"; then
         NO_LD_ARCHIVE_FLAGS=
     fi
     ;;
 esac
 AC_SUBST(NO_LD_ARCHIVE_FLAGS)
 
 dnl ========================================================
@@ -2919,17 +2883,17 @@ case "$target" in
         fi
         ;;
     *-nto*) 
         MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS='-Wl,--version-script,$(BUILD_TOOLS)/gnu-ld-scripts/components-version-script'
         ;;
     *-darwin*)
         MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS='-Wl,-exported_symbols_list -Wl,$(BUILD_TOOLS)/gnu-ld-scripts/components-export-list'
         ;;
-    *-cygwin*|*-mingw*|*-mks*|*-msvc|*-wince|*-winmo)
+    *-mingw*|*-wince|*-winmo)
         if test -n "$GNU_CC"; then
            MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS='-Wl,--version-script,$(BUILD_TOOLS)/gnu-ld-scripts/components-version-script'
         fi
         ;;
 esac
 
 if test -z "$COMPILE_ENVIRONMENT"; then
     SKIP_COMPILER_CHECKS=1
@@ -3886,17 +3850,17 @@ AC_CACHE_CHECK(
         )]
     )
 
 if test "$ac_cv_func_gnu_get_libc_version" = "yes"; then
     AC_DEFINE(HAVE_GNU_GET_LIBC_VERSION)
 fi
 
 case $target_os in
-    os2*|msvc*|mks*|cygwin*|mingw*|darwin*|wince*|winmo*|beos*)
+    darwin*|mingw*|os2*|wince*|winmo*)
         ;;
     *)
     
 AC_CHECK_LIB(c, iconv, [_ICONV_LIBS="$_ICONV_LIBS"],
     AC_CHECK_LIB(iconv, iconv, [_ICONV_LIBS="$_ICONV_LIBS -liconv"],
         AC_CHECK_LIB(iconv, libiconv, [_ICONV_LIBS="$_ICONV_LIBS -liconv"])))
 _SAVE_LIBS=$LIBS
 LIBS="$LIBS $_ICONV_LIBS"
@@ -5017,17 +4981,17 @@ case "${target}" in
     ACCESSIBILITY=
     ;;
 *)
     ACCESSIBILITY=1
     ;;
 esac
 
 case "$target_os" in
-    msvc*|mks*|cygwin*|mingw*)
+    mingw*)
         NS_ENABLE_TSF=1
         if test -z "$GNU_CC"; then 
             if test "$MOZ_WINSDK_TARGETVER" -lt "06000000"; then
                 NS_ENABLE_TSF=
             fi
         fi
         if test -n "$NS_ENABLE_TSF"; then
             AC_DEFINE(NS_ENABLE_TSF)
@@ -5869,17 +5833,17 @@ MOZ_ARG_DISABLE_BOOL(accessibility,
     ACCESSIBILITY=,
     ACCESSIBILITY=1 )
 if test "$ACCESSIBILITY"; then
     AC_DEFINE(ACCESSIBILITY)
 fi
 
 if test -n "$ACCESSIBILITY" -a "$COMPILE_ENVIRONMENT" = "1"; then
 case "$target" in
-*-mingw*|*-cygwin*|*-msvc*|*-mks*)
+*-mingw*)
     if test "$ac_cv_header_atlbase_h" = "no"; then
         AC_MSG_ERROR([System header atlbase.h is not available. See http://developer.mozilla.org/en/docs/atlbase.h for details on fixing this problem.])
     fi
     if test "$ac_cv_header_oleacc_idl" = "no"; then
         AC_MSG_ERROR([System header oleacc.idl is not available. See http://developer.mozilla.org/en/docs/oleacc.idl for details on fixing this problem.])
     fi
     ;;
 esac
@@ -6269,21 +6233,16 @@ esac
 
 MOZ_ARG_ENABLE_BOOL(javaxpcom,
 [  --enable-javaxpcom
                           Enable Java-XPCOM bridge],
     MOZ_JAVAXPCOM=1,
     MOZ_JAVAXPCOM=)
 
 case "$host_os" in
-  cygwin*|msvc*|mks*)
-    if test -n "$JAVA_HOME"; then
-      JAVA_HOME=`cygpath -u \`cygpath -m -s "$JAVA_HOME"\``
-    fi
-    ;;
   *mingw*)
     if test -n "$JAVA_HOME"; then
       JAVA_HOME=`cd "$JAVA_HOME" && pwd`
     fi
     ;;
 esac
 
 if test -n "${JAVA_BIN_PATH}"; then
@@ -6330,19 +6289,19 @@ fi
 dnl ========================================================
 dnl = ANGLE OpenGL->D3D translator for WebGL
 dnl = * only applies to win32
 dnl = * enabled by default (shipping build); requires explicit --disable to disable
 dnl ========================================================
 MOZ_ANGLE=
 MOZ_DIRECTX_SDK_PATH=
 case "$target_os" in
-    *msvc*|*mks*|*cygwin*|*mingw*)
-        MOZ_ANGLE=1
-        ;;
+*mingw*)
+    MOZ_ANGLE=1
+    ;;
 esac
 
 if test -n "$MOZ_ANGLE"; then
 MOZ_ARG_DISABLE_BOOL(angle,
 [  --disable-angle     Disable building of ANGLE for WebGL->D3D translation],
     MOZ_ANGLE=,
     MOZ_ANGLE=1)
 
@@ -6583,22 +6542,21 @@ if test -n "$MOZ_TREE_FREETYPE"; then
    FT2_LIBS='$(call EXPAND_LIBNAME_PATH,freetype,$(DEPTH)/modules/freetype2/.libs)'
    CAIRO_FT_LIBS='$(call EXPAND_LIBNAME_PATH,freetype,$(DEPTH)/modules/freetype2/.libs)'
    AC_DEFINE(HAVE_FT_BITMAP_SIZE_Y_PPEM)
    AC_DEFINE(HAVE_FT_GLYPHSLOT_EMBOLDEN)
    AC_DEFINE(HAVE_FT_LOAD_SFNT_TABLE)
    AC_SUBST(CAIRO_FT_CFLAGS)
 fi
 
-
 dnl ========================================================
 dnl Installer
 dnl ========================================================
 case "$target_os" in
-    aix*|solaris*|linux*|msvc*|mks*|cygwin*|mingw*|os2*|wince*|winmo*)
+    aix*|solaris*|linux*|mingw*|os2*|wince*|winmo*)
         MOZ_INSTALLER=1
         ;;
 esac
 
 MOZ_ARG_DISABLE_BOOL(installer,
 [  --disable-installer     Disable building of installer],
     MOZ_INSTALLER=,
     MOZ_INSTALLER=1)
@@ -6622,17 +6580,16 @@ if test -n "$MOZ_INSTALLER" -a "$OS_ARCH
     AC_MSG_CHECKING([for Unicode NSIS with major version == $REQ_NSIS_MAJOR_VER and minor version >= $MIN_NSIS_MINOR_VER])
     if test "$MAKENSISU_VER" = "" ||
        test ! "$MAKENSISU_MAJOR_VER" = "$REQ_NSIS_MAJOR_VER" -o \
             ! "$MAKENSISU_MINOR_VER" -ge $MIN_NSIS_MINOR_VER; then
         AC_MSG_RESULT([no])
         AC_MSG_ERROR([To build the installer you must have the latest MozillaBuild or Unicode NSIS with a major version of $REQ_NSIS_MAJOR_VER and a minimum minor version of $MIN_NSIS_MINOR_VER in your path. To build without the installer reconfigure using --disable-installer.])
     fi
     AC_MSG_RESULT([yes])
-    MAKENSISU="${CYGWIN_WRAPPER} $MAKENSISU"
 fi
 
 AC_SUBST(MOZ_INSTALLER)
 
 AC_MSG_CHECKING([for tar archiver])
 AC_CHECK_PROGS(TAR, gnutar gtar tar, "")
 if test -z "$TAR"; then
     AC_MSG_ERROR([no tar archiver found in \$PATH])
@@ -6706,17 +6663,17 @@ AC_SUBST(MOZ_ACTIVEX_SCRIPTING_SUPPORT)
 if test -n "$MOZ_NO_ACTIVEX_SUPPORT" -a -n "$MOZ_ACTIVEX_SCRIPTING_SUPPORT";
 then
     AC_MSG_ERROR([Cannot enable ActiveX scripting support when ActiveX support is disabled.])
 fi
 
 if test "$COMPILE_ENVIRONMENT" = "1"; then
 if test -n "$XPC_IDISPATCH_SUPPORT" -o -n "$MOZ_ACTIVEX_SCRIPTING_SUPPORT" -o -z "$MOZ_NO_ACTIVEX_SUPPORT"; then
 case "$target" in
-*-mingw*|*-cygwin*|*-msvc*|*-mks*)
+*-mingw*)
     if test "$ac_cv_header_atlbase_h" = "no"; then
         AC_MSG_ERROR([System header atlbase.h is not available. See http://developer.mozilla.org/en/docs/atlbase.h for details on fixing this problem.])
     fi
     ;;
 esac
 fi
 fi
 
@@ -7476,17 +7433,17 @@ if test "$MOZ_MEMORY"; then
     AC_DEFINE(MOZ_MEMORY_LINUX)
     ;;
   *-netbsd*)
     AC_DEFINE(MOZ_MEMORY_BSD)
     ;;
   *-solaris*)
     AC_DEFINE(MOZ_MEMORY_SOLARIS)
     ;;
-  *-msvc*|*-mks*|*-cygwin*|*-mingw*)
+  *-mingw*)
     AC_DEFINE(MOZ_MEMORY_WINDOWS)
     dnl This is sort of awful. Will revisit if we add support for more versions
     if test "$CC_VERSION" != "14.00.50727.762" -a "$CC_VERSION" != "15.00.30729.01"; then
         AC_MSG_ERROR([Building jemalloc requires exactly Visual C++ 2005 SP1 or 2008 SP1 currently.])
     fi
     if test -z "$WIN32_CRT_SRC_DIR"; then
       if test -z "$VCINSTALLDIR" -o ! -d "$VCINSTALLDIR"; then
         AC_MSG_ERROR([When building jemalloc, set WIN32_CRT_SRC_DIR to the path to the Visual C++ CRT source (usually VCINSTALLDIR\crt\src, but VCINSTALLDIR is not set, so I can't autodetect it for you).])
@@ -8373,24 +8330,23 @@ if test -z "$CROSS_COMPILE"; then
         HOST_LIBIDL_PREFIX="$LIBIDL_PREFIX"
     fi
 fi
 
 if test "$SKIP_IDL_CHECK" = "no"
 then
     _LIBIDL_FOUND=
     case "$host" in
-    *-mingw*|*-cygwin*|*-msvc*|*-mks*)
+    *-mingw*)
         if test -n "$GLIB_PREFIX"; then
             _GLIB_PREFIX_DIR=`cd $GLIB_PREFIX && pwd -W`
             if test "$?" = "0"; then
                 if test `echo ${PATH}: | grep -ic "$_GLIB_PREFIX_DIR/bin:"` = 0; then
                     AC_MSG_ERROR([GLIB_PREFIX must be in your \$PATH.])
                 fi
-                _GLIB_PREFIX_DIR=`$CYGPATH_W $_GLIB_PREFIX_DIR | $CYGPATH_S`
             else
                  AC_MSG_ERROR([GLIB_PREFIX is set but "${GLIB_PREFIX}" is not a directory.])
             fi
         else
             _GLIB_PREFIX_DIR=$MOZ_TOOLS_DIR
         fi
         if test ! -f "${_GLIB_PREFIX_DIR}/include/glib.h"; then
             AC_MSG_ERROR([Cannot find $_GLIB_PREFIX_DIR/include/glib.h .])
@@ -8405,17 +8361,16 @@ then
         fi
 
         if test -n "$HOST_LIBIDL_PREFIX"; then
             _LIBIDL_PREFIX_DIR=`cd $HOST_LIBIDL_PREFIX && pwd -W`
             if test "$?" = "0"; then
                 if test `echo ${PATH}: | grep -ic "$_LIBIDL_PREFIX_DIR/bin:"` = 0; then
                     AC_MSG_ERROR([LIBIDL_PREFIX must be in your \$PATH.])
                 fi
-                _LIBIDL_PREFIX_DIR=`$CYGPATH_W $_LIBIDL_PREFIX_DIR | $CYGPATH_S`
             else
                 AC_MSG_ERROR([LIBIDL_PREFIX is set but "${LIBIDL_PREFIX}" is not a directory.])
             fi
         else
             _LIBIDL_PREFIX_DIR=$MOZ_TOOLS_DIR
         fi        
         if test ! -f "${_LIBIDL_PREFIX_DIR}/include/libIDL/IDL.h"; then
             AC_MSG_ERROR([Cannot find $_LIBIDL_PREFIX_DIR/include/libIDL/IDL.h .])
@@ -8514,17 +8469,17 @@ int main() {
       if test -n "$_MACSAVE_NEXT_ROOT" ; then
         export NEXT_ROOT="$_MACSAVE_NEXT_ROOT"
       fi
     fi
 fi
 
 if test -n "$CROSS_COMPILE"; then
     case "$target" in
-    *-mingw*|*-cygwin*|*-msvc*|*-mks*)
+    *-mingw*)
         if test -n "$GLIB_PREFIX"; then
             GLIB_CFLAGS="-I${GLIB_PREFIX}/include"
             if test -f "${GLIB_PREFIX}/lib/glib-1.2_s.lib"; then
                 GLIB_LIBS="${GLIB_PREFIX}/lib/glib-1.2_s.lib"
             elif test -f "${GLIB_PREFIX}/lib/glib-1.2.lib"; then
                 GLIB_LIBS="${GLIB_PREFIX}/lib/glib-1.2.lib"
             else
                 AC_MSG_ERROR([Cannot find $GLIB_PREFIX/lib/glib-1.2.lib or $GLIB_PREFIX/lib/glib-1.2_s.lib])
@@ -9071,18 +9026,16 @@ AC_SUBST(MOZ_UA_BUILDID)
 AC_SUBST(MOZ_PKG_SPECIAL)
 
 AC_SUBST(MOZILLA_OFFICIAL)
 
 dnl win32 options
 AC_SUBST(MOZ_MAPINFO)
 AC_SUBST(MOZ_BROWSE_INFO)
 AC_SUBST(MOZ_TOOLS_DIR)
-AC_SUBST(CYGWIN_WRAPPER)
-AC_SUBST(AS_PERL)
 AC_SUBST(WIN32_REDIST_DIR)
 AC_SUBST(PYTHON)
 AC_SUBST(MAKENSISU)
 
 AC_SUBST(WINCE)
 AC_SUBST(WINCE_SDK_DIR)
 AC_SUBST(WINCE_WINDOWS_MOBILE)
 
@@ -9324,39 +9277,22 @@ if test "$ACCESSIBILITY" -a "$MOZ_ENABLE
     ATK_MAJOR_VERSION=`echo ${ATK_FULL_VERSION} | $AWK -F\. '{ print $1 }'`
     ATK_MINOR_VERSION=`echo ${ATK_FULL_VERSION} | $AWK -F\. '{ print $2 }'`
     ATK_REV_VERSION=`echo ${ATK_FULL_VERSION} | $AWK -F\. '{ print $3 }'`
     AC_DEFINE_UNQUOTED(ATK_MAJOR_VERSION, $ATK_MAJOR_VERSION)
     AC_DEFINE_UNQUOTED(ATK_MINOR_VERSION, $ATK_MINOR_VERSION)
     AC_DEFINE_UNQUOTED(ATK_REV_VERSION, $ATK_REV_VERSION)
 fi
 
-dnl ========================================================
-dnl Use cygwin wrapper for win32 builds, except MSYS/MinGW
-dnl ========================================================
 case "$host_os" in
 mingw*)
     WIN_TOP_SRC=`cd $srcdir; pwd -W`
     ;;
-cygwin*|msvc*|mks*)
-    HOST_CC="\$(CYGWIN_WRAPPER) $HOST_CC"
-    HOST_CXX="\$(CYGWIN_WRAPPER) $HOST_CXX"
-    CC="\$(CYGWIN_WRAPPER) $CC"
-    CXX="\$(CYGWIN_WRAPPER) $CXX"
-    CPP="\$(CYGWIN_WRAPPER) $CPP"
-    LD="\$(CYGWIN_WRAPPER) $LD"
-    AS="\$(CYGWIN_WRAPPER) $AS"
-    RC="\$(CYGWIN_WRAPPER) $RC"
-    MIDL="\$(CYGWIN_WRAPPER) $MIDL"
-    CYGDRIVE_MOUNT=`mount -p | awk '{ if (/^\//) { print $1; exit } }'`
-    WIN_TOP_SRC=`cygpath -a -w $srcdir | sed -e 's|\\\\|/|g'`
-    ;;
 esac
 
-AC_SUBST(CYGDRIVE_MOUNT)
 AC_SUBST(WIN_TOP_SRC)
 
 AC_SUBST(MOZILLA_VERSION)
 
 AC_SUBST(ac_configure_args)
 
 dnl Spit out some output
 dnl ========================================================
@@ -9458,21 +9394,17 @@ dnl If it succeeds, it outputs a shell c
 dnl   for the files it cannot handle correctly. This way, config.status
 dnl   will handle these files.
 dnl If it fails, nothing is set and config.status will run as usual.
 dnl
 dnl This does not change the $MAKEFILES variable.
 dnl
 dnl OpenVMS gets a line overflow on the long eval command, so use a temp file.
 dnl
-if test -z "${AS_PERL}"; then
 echo $MAKEFILES | ${PERL} $srcdir/build/autoconf/acoutput-fast.pl > conftest.sh
-else
-echo $MAKEFILES | ${PERL} $srcdir/build/autoconf/acoutput-fast.pl -nowrap --cygwin-srcdir=$srcdir > conftest.sh
-fi
 . ./conftest.sh
 rm conftest.sh
 
 echo $MAKEFILES > unallmakefiles
 
 mv -f config/autoconf.mk config/autoconf.mk.orig 2> /dev/null
 
 AC_OUTPUT($MAKEFILES)

deleted file mode 100644
--- a/js/src/build/cygwin-wrapper
+++ /dev/null
@@ -1,75 +0,0 @@
-#!/bin/sh
-#
-# Stupid wrapper to avoid win32 dospath/cygdrive issues
-# Try not to spawn programs from within this file. If the stuff in here looks royally 
-# confusing, see bug: http://bugzilla.mozilla.org/show_bug.cgi?id=206643
-# and look at the older versions of this file that are easier to read, but
-# do basically the same thing
-#
-
-prog=$1
-shift
-if test -z "$prog"; then
-    exit 0
-fi
-
-# If $CYGDRIVE_MOUNT was not set in configure, give $mountpoint the results of mount -p
-mountpoint=$CYGDRIVE_MOUNT
-if test -z "$mountpoint"; then
-    mountpoint=`mount -p`
-    if test -z "$mountpoint"; then
-       print "Cannot determine cygwin mount points. Exiting"
-       exit 1
-    fi
-fi
-
-# Delete everything but "/cygdrive" (or other mountpoint) from mount=`mount -p`
-mountpoint=${mountpoint#*/}
-mountpoint=/${mountpoint%%[!A-Za-z0-9_]*}
-mountpoint=${mountpoint%/}
-
-args=""
-up=""
-if test "${prog}" = "-up"; then
-    up=1
-    prog=${1}
-    shift
-fi
-
-process=1
-
-# Convert the mountpoint in parameters to Win32 filenames
-# For instance: /cygdrive/c/foo -> c:/foo
-for i in "${@}"
-do
-    if test "${i}" = "-wrap"; then
-        process=1
-    else
-        if test "${i}" = "-nowrap"; then
-            process=
-        else
-            if test -n "${process}"; then
-                if test -n "${up}"; then
-                    pathname=${i#-I[a-zA-Z]:/}
-                    if ! test "${pathname}" = "${i}"; then
-                        no_i=${i#-I}
-                        driveletter=${no_i%%:*}
-                        i=-I${mountpoint}/${driveletter}/${pathname}
-                    fi
-                else
-                    eval 'leader=${i%%'${mountpoint}'/[a-zA-Z]/*}'
-                    if ! test "${leader}" = "${i}"; then
-                        eval 'pathname=${i#'${leader}${mountpoint}'/[a-zA-Z]/}'
-                        eval 'no_mountpoint=${i#'${leader}${mountpoint}'/}'
-                        driveletter=${no_mountpoint%%/*}
-                        i=${leader}${driveletter}:/${pathname}
-                    fi
-                fi
-            fi
-
-            args="${args} ${i}"
-        fi
-    fi
-done
-
-exec $prog $args

--- a/js/src/config.mk
+++ b/js/src/config.mk
@@ -57,38 +57,31 @@ else
 OS_RELEASE      := $(shell uname -r)
 endif
 endif
 ifeq ($(OS_ARCH),IRIX64)
 OS_ARCH         := IRIX
 endif
 
 # Handle output from win32 unames other than Netscape's version
-ifeq (,$(filter-out Windows_95 Windows_98 CYGWIN_95-4.0 CYGWIN_98-4.10, $(OS_ARCH)))
+ifeq (,$(filter-out Windows_95 Windows_98, $(OS_ARCH)))
 	OS_ARCH   := WIN95
 endif
 ifeq ($(OS_ARCH),WIN95)
 	OS_ARCH	   := WINNT
 	OS_RELEASE := 4.0
 endif
 ifeq ($(OS_ARCH), Windows_NT)
 	OS_ARCH    := WINNT
 	OS_MINOR_RELEASE := $(shell uname -v)
 	ifeq ($(OS_MINOR_RELEASE),00)
 		OS_MINOR_RELEASE = 0
 	endif
 	OS_RELEASE := $(OS_RELEASE).$(OS_MINOR_RELEASE)
 endif
-ifeq (CYGWIN_NT,$(findstring CYGWIN_NT,$(OS_ARCH)))
-	OS_RELEASE := $(patsubst CYGWIN_NT-%,%,$(OS_ARCH))
-	OS_ARCH    := WINNT
-endif
-ifeq ($(OS_ARCH), CYGWIN32_NT)
-	OS_ARCH    := WINNT
-endif
 ifeq (MINGW32_NT,$(findstring MINGW32_NT,$(OS_ARCH)))
 	OS_RELEASE := $(patsubst MINGW32_NT-%,%,$(OS_ARCH))
 	OS_ARCH    := WINNT
 endif
 
 # Virtually all Linux versions are identical.
 # Any distinctions are handled in linux.h
 ifeq ($(OS_ARCH),Linux)

--- a/js/src/config/autoconf.mk.in
+++ b/js/src/config/autoconf.mk.in
@@ -153,19 +153,16 @@ MOZ_EXCEPTIONS_FLAGS_ON = @_MOZ_EXCEPTIO
 
 MOZ_PROFILE_GUIDED_OPTIMIZE_DISABLE = @MOZ_PROFILE_GUIDED_OPTIMIZE_DISABLE@
 PROFILE_GEN_CFLAGS = @PROFILE_GEN_CFLAGS@
 PROFILE_GEN_LDFLAGS = @PROFILE_GEN_LDFLAGS@
 PROFILE_USE_CFLAGS = @PROFILE_USE_CFLAGS@
 PROFILE_USE_LDFLAGS = @PROFILE_USE_LDFLAGS@
 
 WIN_TOP_SRC	= @WIN_TOP_SRC@
-CYGWIN_WRAPPER	= @CYGWIN_WRAPPER@
-AS_PERL         = @AS_PERL@
-CYGDRIVE_MOUNT	= @CYGDRIVE_MOUNT@
 AR		= @AR@
 AR_FLAGS	= @AR_FLAGS@
 AR_EXTRACT	= @AR_EXTRACT@
 AR_LIST		= @AR_LIST@
 AR_DELETE	= @AR_DELETE@
 AS		= @AS@
 ASFLAGS		= @ASFLAGS@
 AS_DASH_C_FLAG	= @AS_DASH_C_FLAG@

--- a/js/src/config/config.mk
+++ b/js/src/config/config.mk
@@ -444,26 +444,26 @@ endif
 # Personal makefile customizations go in these optional make include files.
 #
 MY_CONFIG	:= $(DEPTH)/config/myconfig.mk
 MY_RULES	:= $(DEPTH)/config/myrules.mk
 
 #
 # Default command macros; can be overridden in <arch>.mk.
 #
-CCC		= $(CXX)
-NFSPWD		= $(CONFIG_TOOLS)/nfspwd
-PURIFY		= purify $(PURIFYOPTIONS)
-QUANTIFY	= quantify $(QUANTIFYOPTIONS)
+CCC = $(CXX)
+NFSPWD = $(CONFIG_TOOLS)/nfspwd
+PURIFY = purify $(PURIFYOPTIONS)
+QUANTIFY = quantify $(QUANTIFYOPTIONS)
 ifdef CROSS_COMPILE
-XPIDL_COMPILE 	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/host/bin/host_xpidl$(HOST_BIN_SUFFIX)
-XPIDL_LINK	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/host/bin/host_xpt_link$(HOST_BIN_SUFFIX)
+XPIDL_COMPILE = $(LIBXUL_DIST)/host/bin/host_xpidl$(HOST_BIN_SUFFIX)
+XPIDL_LINK = $(LIBXUL_DIST)/host/bin/host_xpt_link$(HOST_BIN_SUFFIX)
 else
-XPIDL_COMPILE 	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/bin/xpidl$(BIN_SUFFIX)
-XPIDL_LINK	= $(CYGWIN_WRAPPER) $(LIBXUL_DIST)/bin/xpt_link$(BIN_SUFFIX)
+XPIDL_COMPILE = $(LIBXUL_DIST)/bin/xpidl$(BIN_SUFFIX)
+XPIDL_LINK = $(LIBXUL_DIST)/bin/xpt_link$(BIN_SUFFIX)
 endif
 
 # Java macros
 JAVA_GEN_DIR  = _javagen
 JAVA_DIST_DIR = $(DEPTH)/$(JAVA_GEN_DIR)
 JAVA_IFACES_PKG_NAME = org/mozilla/interfaces
 
 INCLUDES = \
@@ -670,21 +670,21 @@ ifeq (1,$(HAS_XCODE_2_1))
 XCODE_PRODUCT_DIR = build/$(BUILDSTYLE)
 else
 XCODE_PRODUCT_DIR = build
 endif # HAS_XCODE_2_1=1
 endif # OS_ARCH=Darwin
 
 
 ifdef MOZ_NATIVE_MAKEDEPEND
-MKDEPEND_DIR	=
-MKDEPEND	= $(CYGWIN_WRAPPER) $(MOZ_NATIVE_MAKEDEPEND)
+MKDEPEND_DIR =
+MKDEPEND = $(MOZ_NATIVE_MAKEDEPEND)
 else
-MKDEPEND_DIR	= $(CONFIG_TOOLS)/mkdepend
-MKDEPEND	= $(CYGWIN_WRAPPER) $(MKDEPEND_DIR)/mkdepend$(BIN_SUFFIX)
+MKDEPEND_DIR = $(CONFIG_TOOLS)/mkdepend
+MKDEPEND = $(MKDEPEND_DIR)/mkdepend$(BIN_SUFFIX)
 endif
 
 # Set link flags according to whether we want a console.
 ifdef MOZ_WINCONSOLE
 ifeq ($(MOZ_WINCONSOLE),1)
 ifeq ($(OS_ARCH),OS2)
 BIN_FLAGS	+= -Zlinker -PM:VIO
 endif
@@ -738,22 +738,22 @@ GARBAGE		+= $(DEPENDENCIES) $(MKDEPENDEN
 ifeq ($(OS_ARCH),Darwin)
 ifndef NSDISTMODE
 NSDISTMODE=absolute_symlink
 endif
 PWD := $(CURDIR)
 endif
 
 ifdef NSINSTALL_BIN
-NSINSTALL	= $(CYGWIN_WRAPPER) $(NSINSTALL_BIN)
+NSINSTALL = $(NSINSTALL_BIN)
 else
 ifeq (OS2,$(CROSS_COMPILE)$(OS_ARCH))
-NSINSTALL	= $(MOZ_TOOLS_DIR)/nsinstall
+NSINSTALL = $(MOZ_TOOLS_DIR)/nsinstall
 else
-NSINSTALL	= $(CONFIG_TOOLS)/nsinstall$(HOST_BIN_SUFFIX)
+NSINSTALL = $(CONFIG_TOOLS)/nsinstall$(HOST_BIN_SUFFIX)
 endif # OS2
 endif # NSINSTALL_BIN
 
 
 ifeq (,$(CROSS_COMPILE)$(filter-out WINNT OS2, $(OS_ARCH)))
 INSTALL		= $(NSINSTALL)
 else
 ifeq ($(NSDISTMODE),copy)
@@ -772,22 +772,16 @@ else
 INSTALL		= $(NSINSTALL) -R
 endif # absolute_symlink
 endif # copy
 endif # WINNT/OS2
 
 # Use nsinstall in copy mode to install files on the system
 SYSINSTALL	= $(NSINSTALL) -t
 
-ifeq ($(OS_ARCH),WINNT)
-ifneq (,$(CYGDRIVE_MOUNT))
-export CYGDRIVE_MOUNT
-endif
-endif
-
 #
 # Localization build automation
 #
 
 # Because you might wish to "make locales AB_CD=ab-CD", we don't hardcode
 # MOZ_UI_LOCALE directly, but use an intermediate variable that can be
 # overridden by the command line. (Besides, AB_CD is prettier).
 AB_CD = $(MOZ_UI_LOCALE)

--- a/js/src/config/rules.mk
+++ b/js/src/config/rules.mk
@@ -1548,32 +1548,27 @@ ifneq (,$(filter OS2 WINNT WINCE,$(OS_AR
 SEP := ;
 else
 SEP := :
 endif
 
 EMPTY :=
 SPACE := $(EMPTY) $(EMPTY)
 
-# Cygwin and MSYS have their own special path form, but javac expects the source
-# and class paths to be in the DOS form (i.e. e:/builds/...).  This function
-# does the appropriate conversion on Windows, but is a noop on other systems.
+# MSYS has its own special path form, but javac expects the source and class
+# paths to be in the DOS form (i.e. e:/builds/...).  This function does the
+# appropriate conversion on Windows, but is a noop on other systems.
 ifeq (,$(filter-out WINNT WINCE, $(HOST_OS_ARCH)))
-ifdef CYGWIN_WRAPPER
-normalizepath = $(foreach p,$(1),$(shell cygpath -m $(p)))
-else
-# assume MSYS
 #  We use 'pwd -W' to get DOS form of the path.  However, since the given path
 #  could be a file or a non-existent path, we cannot call 'pwd -W' directly
 #  on the path.  Instead, we extract the root path (i.e. "c:/"), call 'pwd -W'
 #  on it, then merge with the rest of the path.
 root-path = $(shell echo $(1) | sed -e "s|\(/[^/]*\)/\?\(.*\)|\1|")
 non-root-path = $(shell echo $(1) | sed -e "s|\(/[^/]*\)/\?\(.*\)|\2|")
 normalizepath = $(foreach p,$(1),$(if $(filter /%,$(1)),$(patsubst %/,%,$(shell cd $(call root-path,$(1)) && pwd -W))/$(call non-root-path,$(1)),$(1)))
-endif
 else
 normalizepath = $(1)
 endif
 
 _srcdir = $(call normalizepath,$(srcdir))
 ifdef JAVA_SOURCEPATH
 SP = $(subst $(SPACE),$(SEP),$(call normalizepath,$(strip $(JAVA_SOURCEPATH))))
 _JAVA_SOURCEPATH = ".$(SEP)$(_srcdir)$(SEP)$(SP)"
@@ -1588,43 +1583,37 @@ else
 _JAVA_CLASSPATH = .
 endif
 
 _JAVA_DIR = _java
 $(_JAVA_DIR)::
 	$(NSINSTALL) -D $@
 
 $(_JAVA_DIR)/%.class: %.java $(GLOBAL_DEPS) $(_JAVA_DIR)
-	$(CYGWIN_WRAPPER) $(JAVAC) $(JAVAC_FLAGS) -classpath $(_JAVA_CLASSPATH) \
+	$(JAVAC) $(JAVAC_FLAGS) -classpath $(_JAVA_CLASSPATH) \
 			-sourcepath $(_JAVA_SOURCEPATH) -d $(_JAVA_DIR) $(_VPATH_SRCS)
 
 $(JAVA_LIBRARY): $(addprefix $(_JAVA_DIR)/,$(JAVA_SRCS:.java=.class)) $(GLOBAL_DEPS)
 	$(JAR) cf $@ -C $(_JAVA_DIR) .
 
 GARBAGE_DIRS += $(_JAVA_DIR)
 
 ###############################################################################
 # Update Makefiles
 ###############################################################################
 
-# In GNU make 3.80, makefiles must use the /cygdrive syntax, even if we're
-# processing them with AS perl. See bug 232003
-ifdef AS_PERL
-CYGWIN_TOPSRCDIR = -nowrap -p $(topsrcdir) -wrap
-endif
-
 # Note: Passing depth to make-makefile is optional.
 #       It saves the script some work, though.
 Makefile: Makefile.in
-	@$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH) $(CYGWIN_TOPSRCDIR)
+	@$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH)
 
 ifdef SUBMAKEFILES
 # VPATH does not work on some machines in this case, so add $(srcdir)
 $(SUBMAKEFILES): % : $(srcdir)/%.in
-	$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH) $(CYGWIN_TOPSRCDIR) $@
+	$(PERL) $(AUTOCONF_TOOLS)/make-makefile -t $(topsrcdir) -d $(DEPTH) $@
 endif
 
 ifdef AUTOUPDATE_CONFIGURE
 $(topsrcdir)/configure: $(topsrcdir)/configure.in
 	(cd $(topsrcdir) && $(AUTOCONF)) && (cd $(DEPTH) && ./config.status --recheck)
 endif
 
 ###############################################################################

--- a/js/src/configure.in
+++ b/js/src/configure.in
@@ -172,17 +172,17 @@ MOZ_ARG_WITH_STRING(dist-dir,
     TOP_DIST=$withval,
     TOP_DIST=dist)
 AC_SUBST(TOP_DIST)
 
 dnl Default to MSVC for win32 and gcc-4.2 for darwin
 dnl ==============================================================
 if test -z "$CROSS_COMPILE"; then
 case "$target" in
-*-cygwin*|*-mingw*|*-msvc*|*-mks*)
+*-mingw*)
     if test -z "$CC"; then CC=cl; fi
     if test -z "$CXX"; then CXX=cl; fi
     if test -z "$CPP"; then CPP="cl -E -nologo"; fi
     if test -z "$CXXCPP"; then CXXCPP="cl -TP -E -nologo"; ac_cv_prog_CXXCPP="$CXXCPP"; fi
     if test -z "$LD"; then LD=link; fi
     if test -z "$AS"; then
         case "${target_cpu}" in
         i*86)
@@ -595,17 +595,17 @@ 502|600|601)
 
 *)
     AC_MSG_ERROR([Invalid value for --with-windows-version ($WINSDK_TARGETVER), must be 502, 600 or 601]);
     ;;
 
 esac
 
 case "$target" in
-*-cygwin*|*-mingw*|*-msvc*|*-mks*|*-wince|*-winmo)
+*-mingw*|*-wince|*-winmo)
     if test "$GCC" != "yes"; then
         # Check to see if we are really running in a msvc environemnt
         _WIN32_MSVC=1
 
         # Make sure compilers are valid
         CFLAGS="$CFLAGS -TC -nologo"
         CXXFLAGS="$CXXFLAGS -TP -nologo"
         # MSVC warning C4345 warns of newly conformant behavior as of VS2003.
@@ -1163,17 +1163,17 @@ fi # COMPILE_ENVIRONMENT
 
 if test -n "$MAKE"; then
   if test `echo $MAKE | grep -c make.py` != 1; then
      NOT_PYMAKE=$MAKE
   fi
 fi
 
 case "$host_os" in
-cygwin*|mingw*|mks*|msvc*)
+mingw*)
     MOZ_PATH_PROGS(GMAKE, $GMAKE $NOT_PYMAKE make gmake, :)
     ;;
 *)
     MOZ_PATH_PROGS(GMAKE, $GMAKE $NOT_PYMAKE gmake make, :)
     ;;
 esac
 if test "$GMAKE" = ":"; then
    AC_MSG_ERROR([GNU make not found])
@@ -1201,17 +1201,16 @@ DLL_PREFIX=lib
 LIB_PREFIX=lib
 DLL_SUFFIX=.so
 OBJ_SUFFIX=o
 LIB_SUFFIX=a
 ASM_SUFFIX=s
 IMPORT_LIB_SUFFIX=
 TARGET_MD_ARCH=unix
 DIRENT_INO=d_ino
-CYGWIN_WRAPPER=
 WIN_TOP_SRC=
 MOZ_USER_DIR=".mozilla"
 
 MOZ_JS_LIBS='-L$(libdir) -lmozjs'
 MOZ_FIX_LINK_PATHS='-Wl,-rpath-link,$(LIBXUL_DIST)/bin -Wl,-rpath-link,$(prefix)/lib'
 
 MOZ_COMPONENT_NSPR_LIBS='-L$(LIBXUL_DIST)/bin $(NSPR_LIBS)'
 
@@ -1265,17 +1264,17 @@ HOST_OS_ARCH=`echo $host_os | sed -e 's|
 # OS_ARCH
 # OS_TEST
 # OS_TARGET
 # OS_RELEASE
 # OS_MINOR_RELEASE
 #
 
 case "$HOST_OS_ARCH" in
-cygwin*|mingw*|mks*|msvc*)
+mingw*)
     HOST_OS_ARCH=WINNT
     ;;
 darwin*)
     HOST_OS_ARCH=Darwin
     ;;
 linux*)
     HOST_OS_ARCH=Linux
     ;;
@@ -1358,23 +1357,18 @@ Windows_NT)
     OS_ARCH=WINNT
     OS_TARGET=WINNT
     OS_MINOR_RELEASE=`uname -v`
     if test "$OS_MINOR_RELEASE" = "00"; then
         OS_MINOR_RELEASE=0
     fi
     OS_RELEASE="${OS_RELEASE}.${OS_MINOR_RELEASE}"
     ;;
-CYGWIN32_NT|CYGWIN_NT*|MINGW*_NT*)
+MINGW*_NT*)
 #
-# If uname -s returns "CYGWIN_NT-4.0", we assume that we are using
-# the uname.exe in the Cygwin tools.
-# Prior to the Beta 20 release, Cygwin was called GNU-Win32.
-# If uname -s returns "CYGWIN32/NT", we assume that we are using
-# the uname.exe in the GNU-Win32 tools.
 # If uname -s returns MINGW32_NT-5.1, we assume that we are using
 # the uname.exe in the MSYS tools.
 #
     OS_RELEASE=`expr $OS_ARCH : '.*NT-\(.*\)'`
     OS_ARCH=WINNT
     OS_TARGET=WINNT
     ;;
 AIX)
@@ -1824,51 +1818,35 @@ dnl System overrides of the defaults for
 dnl ========================================================
 case "$host" in
 *-beos*)
     HOST_CFLAGS="$HOST_CFLAGS -DXP_BEOS -DBeOS -DBEOS -D_POSIX_SOURCE -DNO_X11"
     HOST_NSPR_MDCPUCFG='\"md/_beos.cfg\"'
     HOST_OPTIMIZE_FLAGS="${HOST_OPTIMIZE_FLAGS=-O3}"
     ;;
 
-*cygwin*|*mingw*|*mks*|*msvc*|*wince|*winmo)
+*mingw*|*wince|*winmo)
     # we need Python 2.5 on Windows
     PYTHON_VERSION=2.5
     if test -n "$_WIN32_MSVC"; then
         HOST_AR=lib
         HOST_AR_FLAGS='-NOLOGO -OUT:"$@"'
         HOST_CFLAGS="$HOST_CFLAGS -TC -nologo -Fd\$(HOST_PDBFILE)"
         HOST_RANLIB='echo ranlib'
     else
         HOST_CFLAGS="$HOST_CFLAGS -mno-cygwin"
     fi
     HOST_CFLAGS="$HOST_CFLAGS -DXP_WIN32 -DXP_WIN -DWIN32 -D_WIN32 -DNO_X11"
     HOST_NSPR_MDCPUCFG='\"md/_winnt.cfg\"'
     HOST_OPTIMIZE_FLAGS="${HOST_OPTIMIZE_FLAGS=-O2}"
     HOST_BIN_SUFFIX=.exe
     case "$host" in
     *mingw*)
-    dnl MinGW/MSYS does not need CYGWIN_WRAPPER
         PERL="/bin/sh ${_topsrcdir}/build/msys-perl-wrapper"
         ;;
-    *)
-        CYGWIN_WRAPPER="${srcdir}/build/cygwin-wrapper"
-        if test "`echo ${srcdir} | grep -c ^/ 2>/dev/null`" = 0; then
-            _pwd=`pwd`
-            CYGWIN_WRAPPER="${_pwd}/${srcdir}/build/cygwin-wrapper"
-        fi
-        if test "`${PERL} -v | grep -c cygwin  2>/dev/null`" = 0; then
-            AS_PERL=1
-            PERL="${CYGWIN_WRAPPER} $PERL"
-        fi
-
-        if test "`${PYTHON} -c 'import sys; print sys.platform;'`" != "cygwin"; then
-            PYTHON="${CYGWIN_WRAPPER} $PYTHON"
-        fi
-        ;;
     esac
 
     case "${host_cpu}" in
     x86_64)
         HOST_CFLAGS="$HOST_CFLAGS -D_AMD64_"
         ;;
     esac
     ;;
@@ -2325,17 +2303,17 @@ ia64*-hpux*)
     MKSHLIB=
     DSO_LDOPTS=
     DSO_CFLAGS=
     VISIBILITY_FLAGS=
     TARGET_NSPR_MDCPUCFG='\"md/_symbian.cfg\"'
     RANLIB='echo no ranlib '
 ;;
 
-*-mingw*|*-cygwin*|*-msvc*|*-mks*)
+*-mingw*)
     DSO_CFLAGS=
     DSO_PIC_CFLAGS=
     DLL_SUFFIX=.dll
     RC=rc.exe
     # certain versions of cygwin's makedepend barf on the 
     # #include <string> vs -I./dist/include/string issue so don't use it
     SYSTEM_MAKEDEPEND=
     if test -n "$GNU_CC"; then
@@ -2446,52 +2424,41 @@ ia64*-hpux*)
 
     dnl Hardcode to win95 for now - cls
     TARGET_NSPR_MDCPUCFG='\"md/_win95.cfg\"'
 
     dnl set NO_X11 defines here as the general check is skipped on win32
     no_x=yes
     AC_DEFINE(NO_X11)
 
-    dnl MinGW/MSYS doesn't provide or need cygpath
+    case "$host" in
+    *-mingw*)
+        MOZ_BUILD_ROOT=`cd $MOZ_BUILD_ROOT && pwd -W`
+        ;;
+    esac
+
     case "$host" in
     *-mingw*)
-	CYGPATH_W=echo
-	CYGPATH_S=cat
-	MOZ_BUILD_ROOT=`cd $MOZ_BUILD_ROOT && pwd -W`
-	;;
-    *-cygwin*|*-msvc*|*-mks*)
-	CYGPATH_W="cygpath -a -w"
-	CYGPATH_S="sed -e s|\\\\|/|g"
-	MOZ_BUILD_ROOT=`$CYGPATH_W $MOZ_BUILD_ROOT | $CYGPATH_S`
-	;;
-    esac
-    case "$host" in
-    *-mingw*|*-cygwin*|*-msvc*|*-mks*)
-
-    if test -z "$MOZ_TOOLS"; then
-        AC_MSG_ERROR([MOZ_TOOLS is not set])
-    fi
-
-    MOZ_TOOLS_DIR=`cd $MOZ_TOOLS && pwd -W`
-    if test "$?" != "0" -o -z "$MOZ_TOOLS_DIR"; then
-        AC_MSG_ERROR([cd \$MOZ_TOOLS failed. MOZ_TOOLS ==? $MOZ_TOOLS])
-    fi
-    MOZ_TOOLS_BIN_DIR="$(cd "$MOZ_TOOLS_DIR/bin" && pwd)"
-    if test `echo ${PATH}: | grep -ic "$MOZ_TOOLS_BINDIR:"` = 0; then
-        AC_MSG_ERROR([\$MOZ_TOOLS\\bin must be in your path.])
-    fi
-    MOZ_TOOLS_DIR=`$CYGPATH_W $MOZ_TOOLS_DIR | $CYGPATH_S`
-    ;;
+        if test -z "$MOZ_TOOLS"; then
+            AC_MSG_ERROR([MOZ_TOOLS is not set])
+        fi
+        MOZ_TOOLS_DIR=`cd $MOZ_TOOLS && pwd -W`
+        if test "$?" != "0" -o -z "$MOZ_TOOLS_DIR"; then
+            AC_MSG_ERROR([cd \$MOZ_TOOLS failed. MOZ_TOOLS ==? $MOZ_TOOLS])
+        fi
+        MOZ_TOOLS_BIN_DIR="$(cd "$MOZ_TOOLS_DIR/bin" && pwd)"
+        if test `echo ${PATH}: | grep -ic "$MOZ_TOOLS_BINDIR:"` = 0; then
+            AC_MSG_ERROR([\$MOZ_TOOLS\\bin must be in your path.])
+        fi
+        ;;
     esac 
 
-
     case "$host_os" in
     cygwin*|msvc*|mks*)
-        AC_MSG_WARN([Using a cygwin build environment is unsupported. Configure cannot check for the presence of necessary headers. Please upgrade to MozillaBuild; see https://developer.mozilla.org/en/Windows_Build_Prerequisites.])
+        AC_MSG_ERROR([Using a Cygwin build environment is unsupported. Configure cannot check for presence of necessary headers. Please upgrade to MozillaBuild; see https://developer.mozilla.org/en/Windows_Build_Prerequisites.])
         ;;
     esac
 
     case "$target" in
     i*86-*)
         if test "$HAVE_64BIT_OS"; then
             AC_MSG_ERROR([You are targeting i386 but using the 64-bit compiler.])
         fi
@@ -2863,17 +2830,17 @@ case "$target" in
     NO_LD_ARCHIVE_FLAGS=
     ;;
 *-aix4.3*|*-aix5*)
     NO_LD_ARCHIVE_FLAGS=
     ;;
 *-openvms*)
     NO_LD_ARCHIVE_FLAGS=
     ;;
-*-msvc*|*-mks*|*-mingw*|*-cygwin*|*-wince|*-winmo)
+*-mingw*|*-wince|*-winmo)
     if test -z "$GNU_CC"; then
         NO_LD_ARCHIVE_FLAGS=
     fi
     ;;
 esac
 AC_SUBST(NO_LD_ARCHIVE_FLAGS)
 
 dnl ========================================================
@@ -2895,17 +2862,17 @@ case "$target" in
         fi
         ;;
     *-nto*) 
         MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS='-Wl,--version-script,$(BUILD_TOOLS)/gnu-ld-scripts/components-version-script'
         ;;
     *-darwin*)
         MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS='-Wl,-exported_symbols_list -Wl,$(BUILD_TOOLS)/gnu-ld-scripts/components-export-list'
         ;;
-    *-cygwin*|*-mingw*|*-mks*|*-msvc|*-wince|*-winmo)
+    *-mingw*|*-wince|*-winmo)
         if test -n "$GNU_CC"; then
            MOZ_COMPONENTS_VERSION_SCRIPT_LDFLAGS='-Wl,--version-script,$(BUILD_TOOLS)/gnu-ld-scripts/components-version-script'
         fi
         ;;
 esac
 
 if test -z "$COMPILE_ENVIRONMENT"; then
     SKIP_COMPILER_CHECKS=1
@@ -3027,17 +2994,17 @@ case "$target" in
     AC_DEFINE(AVMPLUS_UNIX)
     ;;
 *-freebsd*|*-kfreebsd*)
     AC_DEFINE(AVMPLUS_UNIX)
     ;;
 *-gnu*)
     AC_DEFINE(AVMPLUS_UNIX)
     ;;
-*-cygwin*|*-mingw*|*-mks*|*-msvc*|*-wince|*-winmo)
+*-mingw*|*-wince|*-winmo)
     AC_DEFINE(AVMPLUS_WIN32)
     ;;
 *-os2*)
     AC_DEFINE(AVMPLUS_OS2)
     ;;
 *)
     AC_MSG_ERROR([Unrecognized nanojit platform. Use --disable-tracejit to build without tracing JIT support.])
 esac
@@ -3842,17 +3809,17 @@ AC_CACHE_CHECK(
         )]
     )
 
 if test "$ac_cv_func_gnu_get_libc_version" = "yes"; then
     AC_DEFINE(HAVE_GNU_GET_LIBC_VERSION)
 fi
 
 case $target_os in
-    os2*|msvc*|mks*|cygwin*|mingw*|darwin*|wince*|winmo*|beos*)
+    darwin*|mingw*|os2*|wince*|winmo*)
         ;;
     *)
     
 AC_CHECK_LIB(c, iconv, [_ICONV_LIBS="$_ICONV_LIBS"],
     AC_CHECK_LIB(iconv, iconv, [_ICONV_LIBS="$_ICONV_LIBS -liconv"],
         AC_CHECK_LIB(iconv, libiconv, [_ICONV_LIBS="$_ICONV_LIBS -liconv"])))
 _SAVE_LIBS=$LIBS
 LIBS="$LIBS $_ICONV_LIBS"
@@ -4932,17 +4899,17 @@ if test "$MOZ_MEMORY"; then
     AC_DEFINE(MOZ_MEMORY_LINUX)
     ;;
   *-netbsd*)
     AC_DEFINE(MOZ_MEMORY_BSD)
     ;;
   *-solaris*)
     AC_DEFINE(MOZ_MEMORY_SOLARIS)
     ;;
-  *-msvc*|*-mks*|*-cygwin*|*-mingw*)
+  *-mingw*)
     AC_DEFINE(MOZ_MEMORY_WINDOWS)
     # the interesting bits will get passed down in MOZ_MEMORY_LDFLAGS
     ;;
   *-*wince)
     AC_DEFINE(MOZ_MEMORY_WINCE)
     AC_DEFINE(MOZ_MEMORY_WINDOWS)
     if test -z "$WINCE_WINDOWS_MOBILE"; then
       AC_DEFINE(MOZ_MEMORY_WINCE6)
@@ -5590,17 +5557,17 @@ MOZ_ARG_ENABLE_BOOL(readline,
     JS_WANT_READLINE=1,
     JS_WANT_READLINE= )
 
 JS_NATIVE_EDITLINE=
 EDITLINE_LIBS=
 JS_DISABLE_SHELL=
 
 case "$target" in
-*-wince*|*-winmo*|*-mingw*|*-cygwin*|*-msvc*|*-mks*)
+*-mingw*|*-wince*|*-winmo*)
     NO_EDITLINE=1
     ;;
 *-symbian*)
     NO_EDITLINE=1
     JS_DISABLE_SHELL=1
     ;;
 *)
     ;;
@@ -5731,18 +5698,16 @@ AC_SUBST(FIREFOX_VERSION)
 AC_SUBST(MOZ_PKG_SPECIAL)
 
 AC_SUBST(MOZILLA_OFFICIAL)
 
 dnl win32 options
 AC_SUBST(MOZ_MAPINFO)
 AC_SUBST(MOZ_BROWSE_INFO)
 AC_SUBST(MOZ_TOOLS_DIR)
-AC_SUBST(CYGWIN_WRAPPER)
-AC_SUBST(AS_PERL)
 AC_SUBST(WIN32_REDIST_DIR)
 AC_SUBST(PYTHON)
 
 AC_SUBST(WINCE)
 AC_SUBST(WINCE_SDK_DIR)
 AC_SUBST(WINCE_WINDOWS_MOBILE)
 
 dnl Echo the CFLAGS to remove extra whitespace.
@@ -5922,38 +5887,22 @@ fi
 
 dnl ========================================================
 dnl JavaScript shell
 dnl ========================================================
 
 AC_HAVE_FUNCS(setlocale)
 AC_HAVE_FUNCS(localeconv)
 
-dnl ========================================================
-dnl Use cygwin wrapper for win32 builds, except MSYS/MinGW
-dnl ========================================================
 case "$host_os" in
 mingw*)
     WIN_TOP_SRC=`cd $srcdir; pwd -W`
     ;;
-cygwin*|msvc*|mks*)
-    HOST_CC="\$(CYGWIN_WRAPPER) $HOST_CC"
-    HOST_CXX="\$(CYGWIN_WRAPPER) $HOST_CXX"
-    CC="\$(CYGWIN_WRAPPER) $CC"
-    CXX="\$(CYGWIN_WRAPPER) $CXX"
-    CPP="\$(CYGWIN_WRAPPER) $CPP"
-    LD="\$(CYGWIN_WRAPPER) $LD"
-    AS="\$(CYGWIN_WRAPPER) $AS"
-    RC="\$(CYGWIN_WRAPPER) $RC"
-    CYGDRIVE_MOUNT=`mount -p | awk '{ if (/^\//) { print $1; exit } }'`
-    WIN_TOP_SRC=`cygpath -a -w $srcdir | sed -e 's|\\\\|/|g'`
-    ;;
 esac
 
-AC_SUBST(CYGDRIVE_MOUNT)
 AC_SUBST(WIN_TOP_SRC)
 
 AC_SUBST(MOZILLA_VERSION)
 
 AC_SUBST(ac_configure_args)
 
 dnl Spit out some output
 dnl ========================================================
@@ -6033,21 +5982,17 @@ dnl If it succeeds, it outputs a shell c
 dnl   for the files it cannot handle correctly. This way, config.status
 dnl   will handle these files.
 dnl If it fails, nothing is set and config.status will run as usual.
 dnl
 dnl This does not change the $MAKEFILES variable.
 dnl
 dnl OpenVMS gets a line overflow on the long eval command, so use a temp file.
 dnl
-if test -z "${AS_PERL}"; then
 echo $MAKEFILES | ${PERL} $srcdir/build/autoconf/acoutput-fast.pl > conftest.sh
-else
-echo $MAKEFILES | ${PERL} $srcdir/build/autoconf/acoutput-fast.pl -nowrap --cygwin-srcdir=$srcdir > conftest.sh
-fi
 . ./conftest.sh
 rm conftest.sh
 
 echo $MAKEFILES > unallmakefiles
 
 mv -f config/autoconf.mk config/autoconf.mk.orig 2> /dev/null
 
 AC_OUTPUT($MAKEFILES)