--- src/pipe.c.orig	2000-08-06 04:27:10.000000000 +0900
+++ src/pipe.c	2020-11-21 15:44:20.000000000 +0900
@@ -32,6 +32,8 @@
 
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <sys/types.h>
 /* #include <bstring.h> */