Correct make distchek and sparse warnings.

1 files changed, 1 insertions, 0 deletions

diff --git a/io.c b/io.c
index 5f1e051..8cec51c 100644
--- a/io.c
+++ b/io.c
@@ -34,6 +34,7 @@ X Window System is a trademark of The Open Group.
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
+#include <unistd.h>
 #include <X11/Xos.h>		/* Needed here for SunOS */
 #include <netinet/in.h>
 #include <arpa/inet.h>