1 files changed, 2 insertions, 3 deletions
diff --git a/generic/tclInt.h b/generic/tclInt.h
index 6870f61..49a299c 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -48,9 +48,8 @@
 #else
 #include <string.h>
 #endif
-#if defined(_WIN32)
-#include <crtdefs.h>
-#elif defined(STDC_HEADERS)
+#if defined(STDC_HEADERS) || defined(__STDC__) || defined(__C99__FUNC__) \
+     || defined(__cplusplus) || defined(_MSC_VER)
 #include <stddef.h>
 #else
 typedef int ptrdiff_t;