--- zerofree-1.1.1/zerofree.c.orig	2019-05-05 19:22:49.000000000 -0500
+++ zerofree-1.1.1/zerofree.c	2019-05-05 19:21:50.000000000 -0500
@@ -17,6 +17,7 @@
  *             Jan Krämer.
  */
 
+#include <sys/types.h>
 #include <ext2fs/ext2fs.h>
 #include <stdio.h>
 #include <unistd.h>