--- a/Makefile
+++ b/Makefile
@@ -68,16 +68,19 @@ ifdef USE_64
 NSPR_CONFIGURE_OPTS += --enable-64bit
 endif
 ifeq ($(OS_TARGET),WIN95)
 NSPR_CONFIGURE_OPTS += --enable-win32-target=WIN95
 endif
 ifdef USE_DEBUG_RTL
 NSPR_CONFIGURE_OPTS += --enable-debug-rtl
 endif
+ifdef USE_STATIC_RTL
+NSPR_CONFIGURE_OPTS += --enable-static-rtl
+endif
 ifdef NS_USE_GCC
 NSPR_COMPILERS = CC=gcc CXX=g++
 endif
 
 #
 # Some pwd commands on Windows (for example, the pwd
 # command in Cygwin) return a pathname that begins
 # with a (forward) slash.  When such a pathname is

--- a/coreconf/WIN32.mk
+++ b/coreconf/WIN32.mk
@@ -124,18 +124,36 @@ else # !NS_USE_GCC
     ifeq ($(_MSC_VER),$(_MSC_VER_6))
     ifndef MOZ_DEBUG_SYMBOLS
 	OS_DLLFLAGS += -PDB:NONE
     endif
     endif
     ifdef USE_DYNAMICBASE
 	OS_DLLFLAGS += -DYNAMICBASE
     endif
+    #
+    # Define USE_DEBUG_RTL if you want to use the debug runtime library
+    # (RTL) in the debug build.
+    # Define USE_STATIC_RTL if you want to use the static RTL.
+    #
+    ifdef USE_DEBUG_RTL
+	ifdef USE_STATIC_RTL
+		OS_CFLAGS += -MTd
+	else
+		OS_CFLAGS += -MDd
+	endif
+	OS_CFLAGS += -D_CRTDBG_MAP_ALLOC
+    else
+	ifdef USE_STATIC_RTL
+		OS_CFLAGS += -MT
+	else
+		OS_CFLAGS += -MD
+	endif
+    endif
     ifdef BUILD_OPT
-	OS_CFLAGS  += -MD
 	ifeq (11,$(ALLOW_OPT_CODE_SIZE)$(OPT_CODE_SIZE))
 		OPTIMIZER += -O1
 	else
 		OPTIMIZER += -O2
 	endif
 	DEFINES    += -UDEBUG -U_DEBUG -DNDEBUG
 	DLLFLAGS   += -OUT:$@
 	ifdef MOZ_DEBUG_SYMBOLS
@@ -143,25 +161,16 @@ else # !NS_USE_GCC
 			OPTIMIZER += $(MOZ_DEBUG_FLAGS) -Fd$(OBJDIR)/
 		else
 			OPTIMIZER += -Zi -Fd$(OBJDIR)/
 		endif
 		DLLFLAGS += -DEBUG -OPT:REF
 		LDFLAGS += -DEBUG -OPT:REF
 	endif
     else
-	#
-	# Define USE_DEBUG_RTL if you want to use the debug runtime library
-	# (RTL) in the debug build
-	#
-	ifdef USE_DEBUG_RTL
-		OS_CFLAGS += -MDd -D_CRTDBG_MAP_ALLOC
-	else
-		OS_CFLAGS += -MD
-	endif
 	OPTIMIZER += -Zi -Fd$(OBJDIR)/ -Od
 	NULLSTRING :=
 	SPACE      := $(NULLSTRING) # end of the line
 	USERNAME   := $(subst $(SPACE),_,$(USERNAME))
 	USERNAME   := $(subst -,_,$(USERNAME))
 	DEFINES    += -DDEBUG -D_DEBUG -UNDEBUG -DDEBUG_$(USERNAME)
 	DLLFLAGS   += -DEBUG -OUT:$@
 	LDFLAGS    += -DEBUG