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-rw-r--r--unix/tclConfig.h.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/unix/tclConfig.h.in b/unix/tclConfig.h.in
index 7922346..9879254 100644
--- a/unix/tclConfig.h.in
+++ b/unix/tclConfig.h.in
@@ -431,6 +431,9 @@
first (like Motorola and SPARC, unlike Intel and VAX). */
#undef WORDS_BIGENDIAN
+/* Are Darwin SUSv3 extensions available? */
+#undef _DARWIN_C_SOURCE
+
/* Add the _ISOC99_SOURCE flag when building */
#undef _ISOC99_SOURCE