musl dropped the GNU version of basename prototype from string.h
in 1.2.5.
Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
--- /dev/null
+--- a/src/ipset.c
++++ b/src/ipset.c
+@@ -6,8 +6,8 @@
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+-#define _GNU_SOURCE
+ #include <assert.h> /* assert */
++#include <libgen.h> /* basename */
+ #include <stdio.h> /* fprintf */
+ #include <stdlib.h> /* exit */
+ #include <string.h> /* strcmp */