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-rw-r--r--src/include/config.h.in9
1 files changed, 8 insertions, 1 deletions
diff --git a/src/include/config.h.in b/src/include/config.h.in
index 916676bf125..ff0431383c4 100644
--- a/src/include/config.h.in
+++ b/src/include/config.h.in
@@ -145,7 +145,14 @@ int isinf(double x);
int gethostname(char *name, int namelen);
#endif
-/* Set to 1 if you have int timezone */
+/* Set to 1 if struct tm has a tm_zone member */
+#undef HAVE_TM_ZONE
+
+/* Set to 1 if you have int timezone.
+ * NOTE: if both tm_zone and a global timezone variable exist,
+ * using the tm_zone field should probably be preferred,
+ * since global variables are inherently not thread-safe.
+ */
#undef HAVE_INT_TIMEZONE
/* Set to 1 if you have cbrt() */