--- a/aclocal.m4
+++ b/aclocal.m4
@@ -7,16 +7,17 @@ builtin(include, build/autoconf/glib.m4)
 builtin(include, build/autoconf/libIDL.m4)dnl
 builtin(include, build/autoconf/nspr.m4)dnl
 builtin(include, build/autoconf/nss.m4)dnl
 builtin(include, build/autoconf/pkg.m4)dnl
 builtin(include, build/autoconf/freetype2.m4)dnl
 builtin(include, build/autoconf/codeset.m4)dnl
 builtin(include, build/autoconf/altoptions.m4)dnl
 builtin(include, build/autoconf/mozprog.m4)dnl
+builtin(include, build/autoconf/mozheader.m4)dnl
 builtin(include, build/autoconf/acwinpaths.m4)dnl
 
 MOZ_PROG_CHECKMSYS()
 
 # Read the user's .mozconfig script.  We can't do this in
 # configure.in: autoconf puts the argument parsing code above anything
 # expanded from configure.in, and we need to get the configure options
 # from .mozconfig in place before that argument parsing code.

new file mode 100644
--- /dev/null
+++ b/build/autoconf/mozheader.m4
@@ -0,0 +1,65 @@
+dnl ***** BEGIN LICENSE BLOCK *****
+dnl Version: MPL 1.1/GPL 2.0/LGPL 2.1
+dnl
+dnl The contents of this file are subject to the Mozilla Public License Version
+dnl 1.1 (the "License"); you may not use this file except in compliance with
+dnl the License. You may obtain a copy of the License at
+dnl http://www.mozilla.org/MPL/
+dnl
+dnl Software distributed under the License is distributed on an "AS IS" basis,
+dnl WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+dnl for the specific language governing rights and limitations under the
+dnl License.
+dnl
+dnl The Original Code is mozilla.org code.
+dnl
+dnl The Initial Developer of the Original Code is the
+dnl Mozilla Foundation <http://www.mozilla.org>
+dnl
+dnl Portions created by the Initial Developer are Copyright (C) 2009
+dnl the Initial Developer. All Rights Reserved.
+dnl
+dnl Contributor(s):
+dnl   Neil Rashbrook <neil@parkwaycc.co.uk>
+dnl
+dnl Alternatively, the contents of this file may be used under the terms of
+dnl either of the GNU General Public License Version 2 or later (the "GPL"),
+dnl or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+dnl in which case the provisions of the GPL or the LGPL are applicable instead
+dnl of those above. If you wish to allow use of your version of this file only
+dnl under the terms of either the GPL or the LGPL, and not to allow others to
+dnl use your version of this file under the terms of the MPL, indicate your
+dnl decision by deleting the provisions above and replace them with the notice
+dnl and other provisions required by the GPL or the LGPL. If you do not delete
+dnl the provisions above, a recipient may use your version of this file under
+dnl the terms of any one of the MPL, the GPL or the LGPL.
+dnl
+dnl ***** END LICENSE BLOCK *****
+
+dnl MOZ_CHECK_HEADER(HEADER-FILE, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+AC_DEFUN(MOZ_CHECK_HEADER,
+[ dnl Do the transliteration at runtime so arg 1 can be a shell variable.
+  ac_safe=`echo "$1" | sed 'y%./+-%__p_%'`
+  AC_MSG_CHECKING([for $1])
+  AC_CACHE_VAL(ac_cv_header_$ac_safe,
+ [ AC_TRY_COMPILE([#include <$1>], ,
+                  eval "ac_cv_header_$ac_safe=yes",
+                  eval "ac_cv_header_$ac_safe=no") ])
+  if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
+    AC_MSG_RESULT(yes)
+    ifelse([$2], , :, [$2])
+  else
+    AC_MSG_RESULT(no)
+    ifelse([$3], , , [$3])
+  fi
+])
+
+dnl MOZ_CHECK_HEADERS(HEADER-FILE... [, ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+AC_DEFUN(MOZ_CHECK_HEADERS,
+[ for ac_hdr in $1
+  do
+    MOZ_CHECK_HEADER($ac_hdr,
+                     [ ac_tr_hdr=HAVE_`echo $ac_hdr | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
+                       AC_DEFINE_UNQUOTED($ac_tr_hdr) $2], $3)
+  done
+])

--- a/configure.in
+++ b/configure.in
@@ -740,17 +740,17 @@ case "$target" in
         *)
             AC_MSG_RESULT([none needed])
             ;;
         esac
 
         # Identify which version of the SDK we're building with
         # Windows Server 2008 and newer SDKs have WinSDKVer.h, get the version
         # from there
-        AC_CHECK_HEADERS([winsdkver.h])
+        MOZ_CHECK_HEADERS([winsdkver.h])
         if test "$ac_cv_header_winsdkver_h" = "yes"; then
             # Get the highest _WIN32_WINNT and NTDDI versions supported
             # Take the higher of the two
             # This is done because the Windows 7 beta SDK reports its
             # NTDDI_MAXVER to be 0x06000100 instead of 0x06010000, as it should
             AC_CACHE_CHECK(for highest Windows version supported by this SDK,
                            ac_cv_winsdk_maxver,
                            [cat > conftest.h <<EOF
@@ -767,17 +767,17 @@ WINSDK_MAXVER
 EOF
                             ac_cv_winsdk_maxver=`$CPP conftest.h 2>/dev/null | tail -n1`
                             rm -f conftest.h
                            ])
             MOZ_WINSDK_MAXVER=${ac_cv_winsdk_maxver}
         else
             # The Vista SDK is the only one to have sdkddkver.h but not
             # WinSDKVer.h
-            AC_CHECK_HEADERS([sdkddkver.h])
+            MOZ_CHECK_HEADERS([sdkddkver.h])
             if test "$ac_cv_header_sdkddkver_h" = "yes"; then
                 MOZ_WINSDK_MAXVER=0x06000000
             else
                 # Assume the Server 2003 Platform SDK
                 MOZ_WINSDK_MAXVER=0x05020000
             fi
         fi
 
@@ -1132,17 +1132,17 @@ tools are selected during the Xcode/Deve
 
   GCC_VERSION_MAJOR=`echo $GCC_VERSION_FULL | $PERL -pe 's/(^\d*).*/$1/;'`
   if test "$GCC_VERSION_MAJOR" -lt "4" ; then
     AC_MSG_ERROR([You need to upgrade the compiler version to 4.x])
   else
     CFLAGS="$CFLAGS -isysroot ${MACOS_SDK_DIR}"
     CXXFLAGS="$CXXFLAGS -isysroot ${MACOS_SDK_DIR}"
 
-    dnl CPP/CXXCPP needs to be set for AC_CHECK_HEADER.
+    dnl CPP/CXXCPP needs to be set for MOZ_CHECK_HEADER.
     CPP="$CPP -isysroot ${MACOS_SDK_DIR}"
     CXXCPP="$CXXCPP -isysroot ${MACOS_SDK_DIR}"
 
     if test "$GCC_VERSION_FULL" = "4.0.0" ; then
       dnl If gcc >= 4.0, we're guaranteed to be on Tiger, which has an ld
       dnl that supports -syslibroot.  Don't set NEXT_ROOT because it will
       dnl be ignored and cause warnings when -syslibroot is specified.
       dnl gcc 4.0.1 will pass -syslibroot to ld automatically based on
@@ -1840,17 +1840,17 @@ MOZ_ARG_ENABLE_BOOL(profiling,
 dnl ========================================================
 dnl = Use Valgrind
 dnl ========================================================
 MOZ_ARG_ENABLE_BOOL(valgrind,
 [  --enable-valgrind       Enable Valgrind integration hooks (default=no)],
     MOZ_VALGRIND=1,
     MOZ_VALGRIND= )
 if test -n "$MOZ_VALGRIND"; then
-    AC_CHECK_HEADER([valgrind/valgrind.h], [],
+    MOZ_CHECK_HEADER([valgrind/valgrind.h], [],
         AC_MSG_ERROR(
             [--enable-valgrind specified but Valgrind is not installed]))
     AC_DEFINE(MOZ_VALGRIND)
 fi
 
 dnl ========================================================
 dnl jprof
 dnl ========================================================
@@ -2041,17 +2041,17 @@ case "$target" in
         fi
     fi
     case "${target_os}" in
     aix4.1*)
         DLL_SUFFIX='_shr.a'
         ;;
     esac
     if test "$COMPILE_ENVIRONMENT"; then
-        AC_CHECK_HEADERS(sys/inttypes.h)
+        MOZ_CHECK_HEADERS(sys/inttypes.h)
     fi
     AC_DEFINE(NSCAP_DISABLE_DEBUG_PTR_TYPES)
     ;;
 
 *-bsdi*)
     dnl -pedantic doesn't play well with BSDI's _very_ modified gcc (shlicc2)
     _PEDANTIC=
     case $OS_RELEASE in
@@ -2353,17 +2353,17 @@ ia64*-hpux*)
     BIN_SUFFIX='.exe'
     MOZ_USER_DIR="Mozilla"
 
     MOZ_GFX_OPTIMIZE_MOBILE=1
 
     # 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, [],
+    ##   MOZ_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*)
     DSO_CFLAGS=
     DSO_PIC_CFLAGS=
     DLL_SUFFIX=.dll
@@ -2509,17 +2509,17 @@ ia64*-hpux*)
     case "$host_os" in
     cygwin*|msvc*|mks*)
         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)
+        MOZ_CHECK_HEADERS(atlbase.h)
         AC_LANG_RESTORE
         ;;
     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.])
@@ -2529,17 +2529,17 @@ ia64*-hpux*)
             LDFLAGS="$LDFLAGS -SAFESEH"
         fi
 
         if test -n "$GNU_CC"; then
             CFLAGS="$CFLAGS -mstackrealign"
             CXXFLAGS="$CXXFLAGS -mstackrealign"
         fi
 
-        AC_CHECK_HEADERS(mmintrin.h)
+        MOZ_CHECK_HEADERS(mmintrin.h)
     	AC_DEFINE(_X86_)
 	;;
     alpha-*)
     	AC_DEFINE(_ALPHA_)
 	;;
     mips-*)
     	AC_DEFINE(_MIPS_)
 	;;
@@ -3350,61 +3350,61 @@ dnl Checks for header files.
 dnl ========================================================
 AC_HEADER_DIRENT
 case "$target_os" in
 freebsd*)
 # for stuff like -lXshm
     CPPFLAGS="${CPPFLAGS} ${X_CFLAGS}"
     ;;
 esac
-AC_CHECK_HEADERS(sys/byteorder.h compat.h getopt.h)
-AC_CHECK_HEADERS(sys/bitypes.h memory.h unistd.h)
-AC_CHECK_HEADERS(gnu/libc-version.h nl_types.h)
-AC_CHECK_HEADERS(malloc.h)
-AC_CHECK_HEADERS(X11/XKBlib.h)
-AC_CHECK_HEADERS(io.h)
+MOZ_CHECK_HEADERS(sys/byteorder.h compat.h getopt.h)
+MOZ_CHECK_HEADERS(sys/bitypes.h memory.h unistd.h)
+MOZ_CHECK_HEADERS(gnu/libc-version.h nl_types.h)
+MOZ_CHECK_HEADERS(malloc.h)
+MOZ_CHECK_HEADERS(X11/XKBlib.h)
+MOZ_CHECK_HEADERS(io.h)
 
 dnl These are all the places some variant of statfs can be hiding.
-AC_CHECK_HEADERS(sys/statvfs.h sys/statfs.h sys/vfs.h sys/mount.h)
+MOZ_CHECK_HEADERS(sys/statvfs.h sys/statfs.h sys/vfs.h sys/mount.h)
 
 dnl Quota support
-AC_CHECK_HEADERS(sys/quota.h)
-AC_CHECK_HEADERS(linux/quota.h)
+MOZ_CHECK_HEADERS(sys/quota.h)
+MOZ_CHECK_HEADERS(linux/quota.h)
 
 dnl Try for MMX support
 dnl NB - later gcc versions require -mmmx for this header to be successfully
 dnl included (or another option which implies it, such as -march=pentium-mmx)
-AC_CHECK_HEADERS(mmintrin.h)
+MOZ_CHECK_HEADERS(mmintrin.h)
 
 dnl Check whether the compiler supports the new-style C++ standard
 dnl library headers (i.e. <new>) or needs the old "new.h"
 AC_LANG_CPLUSPLUS
 NEW_H=new.h
-AC_CHECK_HEADER(new, [NEW_H=new])
+MOZ_CHECK_HEADER(new, [NEW_H=new])
 AC_DEFINE_UNQUOTED(NEW_H, <$NEW_H>)
 AC_LANG_C
 
 AC_ARG_ENABLE(dtrace,
               [  --enable-dtrace         build with dtrace support if available (default=no)],
               [enable_dtrace="yes"],)
 if test "x$enable_dtrace" = "xyes"; then
-  AC_CHECK_HEADER(sys/sdt.h, HAVE_DTRACE=1)
+  MOZ_CHECK_HEADER(sys/sdt.h, HAVE_DTRACE=1)
   if test -n "$HAVE_DTRACE"; then
       AC_DEFINE(INCLUDE_MOZILLA_DTRACE)
   else
       AC_MSG_ERROR([dtrace enabled but sys/sdt.h not found]);
   fi
 fi
 AC_SUBST(HAVE_DTRACE)
 
 case $target in
 *-aix4.3*|*-aix5*)
 	;;
 *)
-	AC_CHECK_HEADERS(sys/cdefs.h)
+	MOZ_CHECK_HEADERS(sys/cdefs.h)
 	;;
 esac
 
 dnl Checks for libraries.
 dnl ========================================================
 case $target in
 *-hpux11.*)
 	;;
@@ -3421,17 +3421,17 @@ dnl they both are just symlinks to libSy
 dnl against libSystem causes issues when debugging (see bug 299601).
 case $target in
 *-darwin*)
     ;;
 *-os2*)
     ;;
 *)
     AC_SEARCH_LIBS(dlopen, dl, 
-        AC_CHECK_HEADER(dlfcn.h, 
+        MOZ_CHECK_HEADER(dlfcn.h, 
         AC_DEFINE(HAVE_DLOPEN)))
     ;;
 esac
 
 _SAVE_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -D_GNU_SOURCE"
 AC_CHECK_FUNCS(dladdr)
 CFLAGS="$_SAVE_CFLAGS"
@@ -3511,36 +3511,36 @@ else
         ;;
     esac
 
     dnl ========================================================
     dnl = Check for XShm
     dnl ========================================================
     AC_CHECK_LIB(Xext, XShmCreateImage, _HAVE_XSHM_XEXT=1,,
         $XLIBS $XEXT_LIBS)
-    AC_CHECK_HEADER(X11/extensions/XShm.h)
+    MOZ_CHECK_HEADER(X11/extensions/XShm.h)
     if test "$ac_cv_header_X11_extensions_XShm_h" = "yes" &&
         test -n "$_HAVE_XSHM_XEXT"; then
         AC_DEFINE(HAVE_XSHM)
     fi
 
     dnl ========================================================
     dnl = Check for Xss
     dnl ========================================================
-    AC_CHECK_HEADER(X11/extensions/scrnsaver.h,
+    MOZ_CHECK_HEADER(X11/extensions/scrnsaver.h,
         AC_CHECK_LIB(Xss, XScreenSaverQueryInfo,
             [XSS_LIBS="-lXss $XEXT_LIBS $XLIBS"
              AC_DEFINE(HAVE_LIBXSS)],, $XEXT_LIBS $XLIBS))
 
     dnl ========================================================
     dnl = Check for XIE
     dnl ========================================================
     AC_CHECK_LIB(XIE, XieFloGeometry, [MOZ_XIE_LIBS="-lXIE"],,
         $XLIBS $XEXT_LIBS)
-    AC_CHECK_HEADER(X11/extensions/XIElib.h)
+    MOZ_CHECK_HEADER(X11/extensions/XIElib.h)
 
     if test "$MOZ_XIE_LIBS"; then
 	dnl ====================================================
 	dnl = If XIE is present and is desired, turn it on
 	dnl ====================================================
 	case $target in
 	    *-hpux*)
 		;;
@@ -4461,21 +4461,21 @@ if test "$ac_cv_thread_keyword" = yes; t
       AC_DEFINE(HAVE_THREAD_TLS_KEYWORD)
       ;;
   esac
 fi
 
 dnl Check for the existence of various allocation headers/functions
 
 MALLOC_H=
-AC_CHECK_HEADER(malloc.h,        [MALLOC_H=malloc.h])
+MOZ_CHECK_HEADER(malloc.h,        [MALLOC_H=malloc.h])
 if test "$MALLOC_H" = ""; then
-  AC_CHECK_HEADER(malloc/malloc.h, [MALLOC_H=malloc/malloc.h])
+  MOZ_CHECK_HEADER(malloc/malloc.h, [MALLOC_H=malloc/malloc.h])
   if test "$MALLOC_H" = ""; then
-    AC_CHECK_HEADER(sys/malloc.h,    [MALLOC_H=sys/malloc.h])
+    MOZ_CHECK_HEADER(sys/malloc.h,    [MALLOC_H=sys/malloc.h])
   fi
 fi
 if test "$MALLOC_H" != ""; then
    AC_DEFINE_UNQUOTED(MALLOC_H, <$MALLOC_H>)
 fi
 
 MOZ_ALLOCATING_FUNCS="strndup posix_memalign memalign valloc"
 AC_CHECK_FUNCS(strndup posix_memalign memalign valloc)
@@ -4677,21 +4677,21 @@ MOZ_ARG_WITH_STRING(system-libevent,
 if test -z "$LIBEVENT_DIR" -o "$LIBEVENT_DIR" = no; then
     MOZ_NATIVE_LIBEVENT=
 else
     if test "${LIBEVENT_DIR}" = "yes"; then
         LIBEVENT_DIR=/usr
     fi
     CFLAGS="-I${LIBEVENT_DIR}/include $CFLAGS"
     LDFLAGS="-L${LIBEVENT_DIR}/lib $LDFLAGS"
-    AC_CHECK_HEADER(event.h,
-                    [if test ! -f "${LIBEVENT_DIR}/include/event.h"; then
-                         AC_MSG_ERROR([event.h found, but is not in ${LIBEVENT_DIR}/include])
-                     fi],
-                    AC_MSG_ERROR([--with-system-libevent requested but event.h not found]))
+    MOZ_CHECK_HEADER(event.h,
+        [if test ! -f "${LIBEVENT_DIR}/include/event.h"; then
+             AC_MSG_ERROR([event.h found, but is not in ${LIBEVENT_DIR}/include])
+         fi],
+        AC_MSG_ERROR([--with-system-libevent requested but event.h not found]))
     AC_CHECK_LIB(event, event_init,
                  [MOZ_NATIVE_LIBEVENT=1
                   MOZ_LIBEVENT_INCLUDES="${LIBEVENT_DIR}/include"
                   MOZ_LIBEVENT_LIBS="-L${LIBEVENT_DIR}/lib -levent"],
                  [MOZ_NATIVE_LIBEVENT= MOZ_LIBEVENT_INCLUDES= MOZ_LIBEVENT_LIBS=])
 fi
 CFLAGS=$_SAVE_CFLAGS
 LDFLAGS=$_SAVE_LDFLAGS
@@ -6038,21 +6038,21 @@ if test -n "$MOZ_WEBM"; then
         _SAVE_CFLAGS=$CFLAGS
         _SAVE_LDFLAGS=$LDFLAGS
         _SAVE_LIBS=$LIBS
         if test "${LIBVPX_DIR}" = "yes"; then
             LIBVPX_DIR=/usr
         fi
         CFLAGS="-I${LIBVPX_DIR}/include $CFLAGS"
         LDFLAGS="-L${LIBVPX_DIR}/lib $LDFLAGS"
-        AC_CHECK_HEADER(vpx/vpx_decoder.h,
-                        [if test ! -f "${LIBVPX_DIR}/include/vpx/vpx_decoder.h"; then
-                             AC_MSG_ERROR([vpx/vpx_decoder.h found, but is not in ${LIBVPX_DIR}/include])
-                         fi],
-                        AC_MSG_ERROR([--with-system-libvpx requested but vpx/vpx_decoder.h not found]))
+        MOZ_CHECK_HEADER(vpx/vpx_decoder.h,
+            [if test ! -f "${LIBVPX_DIR}/include/vpx/vpx_decoder.h"; then
+             AC_MSG_ERROR([vpx/vpx_decoder.h found, but is not in ${LIBVPX_DIR}/include])
+            fi],
+            AC_MSG_ERROR([--with-system-libvpx requested but vpx/vpx_decoder.h not found]))
         AC_CHECK_LIB(vpx, vpx_codec_dec_init_ver,
                      [MOZ_NATIVE_LIBVPX=1
                       MOZ_LIBVPX_INCLUDES="-I${LIBVPX_DIR}/include"
                       MOZ_LIBVPX_LIBS="-L${LIBVPX_DIR}/lib -lvpx"],
                      ([--with-system-libvpx requested but symbol vpx_codec_dec_init_ver not found]))
         CFLAGS=$_SAVE_CFLAGS
         LDFLAGS=$_SAVE_LDFLAGS
         LIBS=$_SAVE_LIBS
@@ -6443,17 +6443,17 @@ if test -n "$MOZ_CRASHREPORTER"; then
    AC_DEFINE(MOZ_CRASHREPORTER)
 
   if (test "$OS_TARGET" = "Linux" -o "$OS_ARCH" = "SunOS") && \
     test -z "$SKIP_LIBRARY_CHECKS"; then
     PKG_CHECK_MODULES(MOZ_GTHREAD, gthread-2.0)
     AC_SUBST(MOZ_GTHREAD_CFLAGS)
     AC_SUBST(MOZ_GTHREAD_LIBS)
 
-    AC_CHECK_HEADERS([curl/curl.h], [], [AC_MSG_ERROR([Couldn't find curl/curl.h which is required for the crash reporter.  Use --disable-crashreporter to disable the crash reporter.])])
+    MOZ_CHECK_HEADERS([curl/curl.h], [], [AC_MSG_ERROR([Couldn't find curl/curl.h which is required for the crash reporter.  Use --disable-crashreporter to disable the crash reporter.])])
   fi
 fi
 
 MOZ_ARG_WITH_STRING(crashreporter-enable-percent,
 [  --with-crashreporter-enable-percent=NN
                           Enable sending crash reports by default on NN% of users. (default=100)],
 [ val=`echo $withval | sed 's/[^0-9]//g'`
     MOZ_CRASHREPORTER_ENABLE_PERCENT="$val"])
@@ -7093,18 +7093,18 @@ if test $MOZ_PLATFORM_MAEMO; then
    fi
 
    MOZ_GFX_OPTIMIZE_MOBILE=1
    MOZ_WEBGL_GLX=
    MOZ_MAEMO_LIBLOCATION=
 
    if test $MOZ_PLATFORM_MAEMO = 5; then
       dnl if we have Xcomposite we should also have Xdamage and Xfixes
-      AC_CHECK_HEADERS([X11/extensions/Xdamage.h], [],
-                       [AC_MSG_ERROR([Couldn't find X11/extensions/Xdamage.h which is required for composited plugins.])])
+      MOZ_CHECK_HEADERS([X11/extensions/Xdamage.h], [],
+          [AC_MSG_ERROR([Couldn't find X11/extensions/Xdamage.h which is required for composited plugins.])])
       AC_CHECK_LIB(Xcomposite, XCompositeRedirectWindow, [XCOMPOSITE_LIBS="-lXcomposite -lXdamage -lXfixes"],
                    [MISSING_X="$MISSING_X -lXcomposite"], $XLIBS)
 
       AC_SUBST(XCOMPOSITE_LIBS)
 
       PKG_CHECK_MODULES(LIBHILDONMIME,libhildonmime, _LIB_FOUND=1, _LIB_FOUND=)
       MOZ_PLATFORM_MAEMO_LIBS="$MOZ_PLATFORM_MAEMO_LIBS $LIBHILDONMIME_LIBS"
       MOZ_PLATFORM_MAEMO_CFLAGS="$MOZ_PLATFORM_MAEMO_CFLAGS $LIBHILDONMIME_CFLAGS"
@@ -7832,17 +7832,17 @@ if test "$HAVE_DEMANGLE" -a "$HAVE_GCC3_
     AC_DEFINE(MOZ_DEMANGLE_SYMBOLS)
 fi
 AC_SUBST(MOZ_DEMANGLE_SYMBOLS)
 
 dnl ========================================================
 dnl = Support for gcc stack unwinding (from gcc 3.3)
 dnl ========================================================
 if test "$HAVE_GCC3_ABI" -a -z "$SKIP_LIBRARY_CHECKS"; then
-    AC_CHECK_HEADER(unwind.h, AC_CHECK_FUNCS(_Unwind_Backtrace))
+    MOZ_CHECK_HEADER(unwind.h, AC_CHECK_FUNCS(_Unwind_Backtrace))
 fi
 
 dnl ========================================================
 dnl =
 dnl = Misc. Options
 dnl = 
 dnl ========================================================
 MOZ_ARG_HEADER(Misc. Options)
@@ -8611,17 +8611,17 @@ MOZ_TREE_CAIRO=1 )
 
 MOZ_TREE_PIXMAN=1
 MOZ_ARG_ENABLE_BOOL(system-pixman,
 [ --enable-system-pixman Use system pixman (located with pkgconfig)],
 MOZ_TREE_PIXMAN=,
 MOZ_TREE_PIXMAN=1 )
 
 # Check for headers defining standard int types.
-AC_CHECK_HEADERS(stdint.h inttypes.h sys/int_types.h)
+MOZ_CHECK_HEADERS(stdint.h inttypes.h sys/int_types.h)
 
 if test "$MOZ_TREE_CAIRO"; then
     AC_DEFINE(MOZ_TREE_CAIRO)
 
     # For now we assume that we will have a uint64_t available through
     # one of the above headers or mozstdint.h.
     AC_DEFINE(HAVE_UINT64_T)
 
@@ -8656,21 +8656,21 @@ if test "$MOZ_TREE_CAIRO"; then
                 WIN32_D2D_SURFACE_FEATURE=
             fi
         else
             WIN32_FONT_FEATURE=
             WIN32_DWRITE_FONT_FEATURE=
             WIN32_D2D_SURFACE_FEATURE=
         fi
 
-        AC_CHECK_HEADER(d3d9.h, MOZ_ENABLE_D3D9_LAYER=1)
+        MOZ_CHECK_HEADER(d3d9.h, MOZ_ENABLE_D3D9_LAYER=1)
 
         dnl D3D10 Layers depend on D2D Surfaces.
         if test -n "$WIN32_D2D_SURFACE_FEATURE"; then
-          AC_CHECK_HEADER(d3d10.h, MOZ_ENABLE_D3D10_LAYER=1)
+          MOZ_CHECK_HEADER(d3d10.h, MOZ_ENABLE_D3D10_LAYER=1)
         fi
 
     fi
     if test "$MOZ_WIDGET_TOOLKIT" = "os2"; then
         OS2_SURFACE_FEATURE="#define CAIRO_HAS_OS2_SURFACE 1"
         FT_FONT_FEATURE="#define CAIRO_HAS_FT_FONT 1"
         MOZ_ENABLE_CAIRO_FT=1
         CAIRO_FT_CFLAGS="-I${MZFTCFGFT2}/include"
@@ -8873,17 +8873,17 @@ if test "$NECKO_WIFI" -a \
         "$OS_ARCH" != "SunOS" -a \
         "$OS_ARCH" != "WINNT" -a \
         "$OS_ARCH" != "WINCE"; then
   AC_MSG_ERROR([Necko WiFi scanning not supported on your platform, use --disable-necko-wifi])
 fi
 
 if test -z "$SKIP_LIBRARY_CHECKS" -a "$NECKO_WIFI" -a "$OS_ARCH" = "Linux"
 then
-  AC_CHECK_HEADER([iwlib.h])
+  MOZ_CHECK_HEADER([iwlib.h])
   if test "$ac_cv_header_iwlib_h" != "yes"; then
     AC_MSG_ERROR([Can't find header iwlib.h for Necko WiFi scanning (might be in package libiw-dev (Ubuntu) or wireless-tools-devel (Fedora)); use --disable-necko-wifi to disable])
   fi
 fi
 
 if test "$NECKO_WIFI"; then
   AC_DEFINE(NECKO_WIFI)
 fi
@@ -9292,28 +9292,28 @@ if test "$MOZ_X11"; then
     if test ! -z "$MISSING_X"; then
         AC_MSG_ERROR([ Could not find the following X libraries: $MISSING_X ]);
     fi
 
 fi # MOZ_X11
 
 dnl Check for headers, etc. needed by WebGL.
 if test -n "$MOZ_WEBGL_GLX"; then
-    AC_CHECK_HEADER(GL/glx.h)
+    MOZ_CHECK_HEADER(GL/glx.h)
     if test "$ac_cv_header_GL_glx_h" != "yes"; then
         AC_MSG_ERROR([Can't find header GL/glx.h for WebGL (install mesa-common-dev (Ubuntu), mesa-libGL-devel (Fedora), or Mesa (SuSE))])
     fi
 fi # MOZ_WEBGL_GLX
 fi # COMPILE_ENVIRONMENT
 
 if test "$USE_FC_FREETYPE"; then
     if test "$COMPILE_ENVIRONMENT"; then
     	_SAVE_CPPFLAGS="$CPPFLAGS"
     	CPPFLAGS="$CPPFLAGS $FT2_CFLAGS $XCFLAGS"
-        AC_CHECK_HEADERS(fontconfig/fcfreetype.h, , 
+        MOZ_CHECK_HEADERS(fontconfig/fcfreetype.h, , 
             [AC_MSG_ERROR(Can't find header fontconfig/fcfreetype.h.)])
     	CPPFLAGS="$_SAVE_CPPFLAGS"
     else
         AC_DEFINE(HAVE_FONTCONFIG_FCFREETYPE_H)
     fi
 fi
 
 dnl Set various defines and substitutions