commit - 02be36069ec229663cf3766486c231e8d1b6d469
commit + 4a367fcdec21bc12e243220a62005996ad607ab7
blob - 3fc07eaa6783b32515760bb9b6f75e6b35b3d755
blob + 892d9968dadc166349f602d673a39f7fc3b5aaa3
--- proc.c
+++ proc.c
@@ -24,6 +24,7 @@
 #include <sys/wait.h>
 
 #include <fcntl.h>
+#include <grp.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>