diff --git a/include/time.h b/include/time.h
index 067b5196812190f1b13b23b76218734f6961bf53..ecdc66dff781d05d92b8429ec40ffd7355b0355e 100644
--- a/include/time.h
+++ b/include/time.h
@@ -114,6 +114,9 @@ struct tm *getdate (const char *);
 int stime(time_t *);
 #endif
 
+#if defined(_GNU_SOURCE)
+time_t timegm(struct tm *);
+#endif
 
 #ifdef __cplusplus
 }
diff --git a/src/time/timegm.c b/src/time/timegm.c
new file mode 100644
index 0000000000000000000000000000000000000000..6d08917e449518bb00179d56d7e38e8a2e61a98d
--- /dev/null
+++ b/src/time/timegm.c
@@ -0,0 +1,9 @@
+#define _GNU_SOURCE
+#include <time.h>
+
+#include "__time.h"
+
+time_t timegm(struct tm *tm)
+{
+	return __tm_to_time(tm);
+}