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-rw-r--r--generic/tclInt.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/generic/tclInt.h b/generic/tclInt.h
index 18574c3..6113f23 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -48,7 +48,8 @@
#else
#include <string.h>
#endif
-#ifdef STDC_HEADERS
+#if defined(STDC_HEADERS) || defined(__STDC__) || defined(__C99__FUNC__) \
+ || defined(__cplusplus) || defined(_MSC_VER)
#include <stddef.h>
#else
typedef int ptrdiff_t;