Index: hplip-3.20.9/scan/sane/http.c
===================================================================
--- hplip-3.20.9.orig/scan/sane/http.c
+++ hplip-3.20.9/scan/sane/http.c
@@ -33,6 +33,7 @@
#include <stdio.h>
#include <stdlib.h>
+#include <unistd.h>
#include <string.h>
#include <syslog.h>
#include <ctype.h>
