what

https://gitlab.alpinelinux.org/alpine/aports/-/issues/15911

diff --git a/src/ipset.c b/src/ipset.c
index 162f477..5eca659 100644
--- a/src/ipset.c
+++ b/src/ipset.c
@@ -13,2 +13,3 @@
 #include <string.h>			/* strcmp */
+#include <libgen.h>			/* basename */