musl - musl - an implementation of the standard library for Linux-based systems

diff --git a/src/string/strsep.c b/src/string/strsep.c
index 1bfe1db1..cb37c32e 100644
--- a/src/string/strsep.c
+++ b/src/string/strsep.c

@@ -1,3 +1,4 @@

+#define _GNU_SOURCE

#include <string.h>

char *strsep(char **str, const char *sep)