--- a/libetc.c
+++ b/libetc.c
@@ -22,6 +22,7 @@
 #define _GNU_SOURCE
 #include <dlfcn.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <string.h>
 #include <dirent.h>