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-rw-r--r--win/tkWinPort.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/win/tkWinPort.h b/win/tkWinPort.h
index f5ac68b..8cc5677 100644
--- a/win/tkWinPort.h
+++ b/win/tkWinPort.h
@@ -24,6 +24,7 @@
#include <wchar.h>
#include <io.h>
#include <stdlib.h>
+#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <malloc.h>