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-rw-r--r--win32/Makefile.sub1
1 files changed, 1 insertions, 0 deletions
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 8f1d779207..bbca662bff 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -552,6 +552,7 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub
#define HAVE_COSH 1
#define HAVE_SINH 1
#define HAVE_TANH 1
+#define HAVE_SIGNBIT 1
#define HAVE_TZNAME 1
#define HAVE_DAYLIGHT 1
#define SETPGRP_VOID 1