--- config/autoconf.mk.in	2014-08-12 17:40:57.000000000 +0200
+++ config/autoconf.mk.in	2014-10-03 12:26:40.054472479 +0200
@@ -32,6 +32,7 @@
 OBJ_SUFFIX	= $(error config/config.mk needs to be included before using OBJ_SUFFIX)
 _OBJ_SUFFIX	= @OBJ_SUFFIX@
 LIB_SUFFIX	= @LIB_SUFFIX@
+IMPORT_LIB_SUFFIX = @IMPORT_LIB_SUFFIX@
 DLL_SUFFIX	= @DLL_SUFFIX@
 ASM_SUFFIX	= @ASM_SUFFIX@
 MOD_NAME	= @NSPR_MODNAME@
--- config/rules.mk
+++ config/rules.mk
@@ -85,16 +85,16 @@ SHARED_LIBRARY	= $(OBJDIR)/$(LIBRARY_NAME)$(LIBRARY_VERSION).$(DLL_SUFFIX)
 SHARED_LIB_PDB	= $(OBJDIR)/$(LIBRARY_NAME)$(LIBRARY_VERSION).pdb
 ifdef MSC_VER
 LIBRARY         = $(OBJDIR)/$(LIBRARY_NAME)$(LIBRARY_VERSION)_s.$(LIB_SUFFIX)
-IMPORT_LIBRARY  = $(OBJDIR)/$(LIBRARY_NAME)$(LIBRARY_VERSION).$(LIB_SUFFIX)
+IMPORT_LIBRARY  = $(OBJDIR)/$(LIBRARY_NAME)$(LIBRARY_VERSION).$(IMPORT_LIB_SUFFIX)
 else
 LIBRARY         = $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION)_s.$(LIB_SUFFIX)
-IMPORT_LIBRARY  = $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION).$(LIB_SUFFIX)
+IMPORT_LIBRARY  = $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION).$(IMPORT_LIB_SUFFIX)
 endif
 else
 SHARED_LIBRARY	= $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION).$(DLL_SUFFIX)
 SHARED_LIB_PDB	= $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION).pdb
 LIBRARY         = $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION)_s.$(LIB_SUFFIX)
-IMPORT_LIBRARY  = $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION).$(LIB_SUFFIX)
+IMPORT_LIBRARY  = $(OBJDIR)/lib$(LIBRARY_NAME)$(LIBRARY_VERSION).$(IMPORT_LIB_SUFFIX)
 endif
 
 else
--- configure	2014-08-12 17:40:57.000000000 +0200
+++ configure	2014-10-03 12:43:25.285681512 +0200
@@ -664,6 +664,7 @@
 WRAP_LDFLAGS
 ASM_SUFFIX
 DLL_SUFFIX
+IMPORT_LIB_SUFFIX
 LIB_SUFFIX
 OBJ_SUFFIX
 CPU_ARCH
@@ -5618,6 +5619,7 @@
 
 OBJ_SUFFIX=o
 LIB_SUFFIX=a
+IMPORT_LIB_SUFFIX=$(IMPORT_LIB_SUFFIX)
 DLL_SUFFIX=so
 ASM_SUFFIX=s
 MKSHLIB='$(LD) $(DSO_LDOPTS) -o $@'
@@ -7104,6 +7106,7 @@
         CC="$CC -mwindows"
         CXX="$CXX -mwindows"
         DLL_SUFFIX=dll
+        IMPORT_LIB_SUFFIX=dll.a
         MKSHLIB='$(CC) -shared -Wl,--export-all-symbols -Wl,--out-implib -Wl,$(IMPORT_LIBRARY) $(DLLBASE) -o $(subst $(OBJDIR)/,,$(SHARED_LIBRARY))'
         RC=$WINDRES
         # Use temp file for windres (bug 213281)
@@ -7118,6 +7121,7 @@
         GARBAGE='$(OBJDIR)/vc20.pdb $(OBJDIR)/vc40.pdb'
         OBJ_SUFFIX=obj
         LIB_SUFFIX=lib
+        IMPORT_LIB_SUFFIX=lib
         DLL_SUFFIX=dll
 
         # Determine compiler version
@@ -7232,11 +7236,11 @@
 
         if test "$OS_TARGET" = "WINNT"; then
             CFLAGS="$CFLAGS -GT"
-            LIBNSPR='$(dist_libdir)/libnspr$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
-            LIBPLC='$(dist_libdir)/libplc$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
+            LIBNSPR='$(dist_libdir)/libnspr$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
+            LIBPLC='$(dist_libdir)/libplc$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
         else
-            LIBNSPR='$(dist_libdir)/nspr$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
-            LIBPLC='$(dist_libdir)/plc$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
+            LIBNSPR='$(dist_libdir)/nspr$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
+            LIBPLC='$(dist_libdir)/plc$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
         fi
     fi # GNU_CC
 
@@ -7716,6 +7720,7 @@
 
     USE_PTHREADS=1
     LIB_SUFFIX=lib
+    IMPORT_LIB_SUFFIX=lib
     DLL_SUFFIX=dll
     MKSHLIB=
     DSO_LDOPTS=
@@ -7780,6 +7785,7 @@
     $as_echo "#define TCPV40HDRS 1" >>confdefs.h
 
     LIB_SUFFIX=lib
+    IMPORT_LIB_SUFFIX=lib
     DLL_SUFFIX=dll
     RC=rc.exe
     PR_MD_ARCH_DIR=os2
--- configure.in	2014-08-12 17:40:57.000000000 +0200
+++ configure.in	2014-10-03 12:43:09.638035918 +0200
@@ -854,6 +854,7 @@
 dnl ========================================================
 OBJ_SUFFIX=o
 LIB_SUFFIX=a
+IMPORT_LIB_SUFFIX=$(IMPORT_LIB_SUFFIX)
 DLL_SUFFIX=so
 ASM_SUFFIX=s
 MKSHLIB='$(LD) $(DSO_LDOPTS) -o $@'
@@ -1916,6 +1917,7 @@
         CC="$CC -mwindows"
         CXX="$CXX -mwindows"
         DLL_SUFFIX=dll
+        IMPORT_LIB_SUFFIX=dll.a
         MKSHLIB='$(CC) -shared -Wl,--export-all-symbols -Wl,--out-implib -Wl,$(IMPORT_LIBRARY) $(DLLBASE) -o $(subst $(OBJDIR)/,,$(SHARED_LIBRARY))'
         RC=$WINDRES
         # Use temp file for windres (bug 213281)
@@ -1930,6 +1932,7 @@
         GARBAGE='$(OBJDIR)/vc20.pdb $(OBJDIR)/vc40.pdb'
         OBJ_SUFFIX=obj
         LIB_SUFFIX=lib
+        IMPORT_LIB_SUFFIX=lib
         DLL_SUFFIX=dll
 
         # Determine compiler version
@@ -2046,11 +2049,11 @@
         
         if test "$OS_TARGET" = "WINNT"; then
             CFLAGS="$CFLAGS -GT"
-            LIBNSPR='$(dist_libdir)/libnspr$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
-            LIBPLC='$(dist_libdir)/libplc$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
+            LIBNSPR='$(dist_libdir)/libnspr$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
+            LIBPLC='$(dist_libdir)/libplc$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
         else
-            LIBNSPR='$(dist_libdir)/nspr$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
-            LIBPLC='$(dist_libdir)/plc$(MOD_MAJOR_VERSION).$(LIB_SUFFIX)'
+            LIBNSPR='$(dist_libdir)/nspr$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
+            LIBPLC='$(dist_libdir)/plc$(MOD_MAJOR_VERSION).$(IMPORT_LIB_SUFFIX)'
         fi
     fi # GNU_CC
 
@@ -2452,6 +2455,7 @@
     AC_DEFINE(HAVE_SOCKLEN_T)
     USE_PTHREADS=1
     LIB_SUFFIX=lib
+    IMPORT_LIB_SUFFIX=lib
     DLL_SUFFIX=dll
     MKSHLIB=
     DSO_LDOPTS=
@@ -2506,6 +2510,7 @@
     AC_DEFINE(BSD_SELECT)
     AC_DEFINE(TCPV40HDRS)
     LIB_SUFFIX=lib
+    IMPORT_LIB_SUFFIX=lib
     DLL_SUFFIX=dll
     RC=rc.exe
     PR_MD_ARCH_DIR=os2
@@ -3085,6 +3090,7 @@
 
 AC_SUBST(OBJ_SUFFIX)
 AC_SUBST(LIB_SUFFIX)
+AC_SUBST(IMPORT_LIB_SUFFIX)
 AC_SUBST(DLL_SUFFIX)
 AC_SUBST(ASM_SUFFIX)
 AC_SUBST(WRAP_LDFLAGS)
--- pr/include/md/_win95.cfg	2014-08-12 17:40:57.000000000 +0200
+++ pr/include/md/_win95.cfg	2014-10-03 12:26:40.072472067 +0200
@@ -68,7 +68,7 @@
 #define PR_BYTES_PER_WORD_LOG2	2
 #define PR_BYTES_PER_DWORD_LOG2	3
 
-#elif defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_)
+#elif defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_) || defined (_WIN64)
 
 #define IS_LITTLE_ENDIAN 1
 #undef  IS_BIG_ENDIAN
--- pr/include/md/_winnt.cfg	2014-08-12 17:40:57.000000000 +0200
+++ pr/include/md/_winnt.cfg	2014-10-03 12:26:40.072472067 +0200
@@ -68,7 +68,7 @@
 #define PR_BYTES_PER_WORD_LOG2	2
 #define PR_BYTES_PER_DWORD_LOG2	2
 
-#elif defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_)
+#elif defined(_M_X64) || defined(_M_AMD64) || defined(_AMD64_) || defined (_WIN64)
 
 #define IS_LITTLE_ENDIAN 1
 #undef  IS_BIG_ENDIAN
--- pr/src/md/windows/ntgc.c	2014-08-12 17:40:57.000000000 +0200
+++ pr/src/md/windows/ntgc.c	2014-10-03 12:26:40.073472045 +0200
@@ -12,7 +12,7 @@
 
 PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np) 
 {
-#if defined(_X86_)
+#if defined(_X86_) && (!defined(_AMD64_))
     CONTEXT context;
     context.ContextFlags = CONTEXT_INTEGER;
 
--- tools/Makefile.in	2014-08-12 17:40:57.000000000 +0200
+++ tools/Makefile.in	2014-10-03 12:31:18.265158552 +0200
@@ -167,7 +167,7 @@
 	echo winsock.lib     >>w16link
 	wlink @w16link.
 else
-	link $(LDOPTS) $< $(LIBPR) $(LIBPLC) ws2_32.lib -out:$@
+	link $(LDOPTS) $< $(LIBPR) $(LIBPLC) ws2_32.lib mswsock.lib -out:$@
 endif
 else
 ifeq ($(OS_ARCH),OS2)