Add timegm to list of functions tested, for Marc-Andre L.
diff --git a/config.h.in b/config.h.in
index 6d01d3b..065d723 100644
--- a/config.h.in
+++ b/config.h.in
@@ -295,6 +295,9 @@
 /* Define if you have the tcsetpgrp function.  */
 #undef HAVE_TCSETPGRP
 
+/* Define if you have the timegm function.  */
+#undef HAVE_TIMEGM
+
 /* Define if you have the times function.  */
 #undef HAVE_TIMES