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-rw-r--r--win32/Makefile.sub3
1 files changed, 3 insertions, 0 deletions
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index d10e82986c..519dc8cd51 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -692,6 +692,9 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub
!if "$(MACHINE)" == "x86" || "$(ARCH)" == "x64" || "$(ARCH)" == "ia64"
#define STACK_GROW_DIRECTION -1
!endif
+!if "$(ARCH)" != "ia64" && NTVER >= 0x0400 # r27646
+#define FIBER_USE_NATIVE 1
+!endif
#define CANONICALIZATION_FOR_MATHN 1
#define DEFAULT_KCODE KCODE_NONE
!if "$(ENABLE_DEBUG_ENV)" == "yes"