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-rw-r--r--win/tclWinPort.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/win/tclWinPort.h b/win/tclWinPort.h
index a3e5830..4fe8754 100644
--- a/win/tclWinPort.h
+++ b/win/tclWinPort.h
@@ -83,6 +83,9 @@
#ifdef __CYGWIN__
# include <unistd.h>
+# ifndef _vsnprintf
+# define _vsnprintf vsnprintf
+# endif
# ifndef _wcsicmp
# define _wcsicmp wcscasecmp
# endif