buffer is compared with cp, and so needs to be changed to unsigned too.

diff --git a/uip/post.c b/uip/post.c
index 1f706fe..d99da1f 100644 (file)
--- a/uip/post.c
+++ b/uip/post.c
@@ -1288,7 +1288,7 @@ static int
 find_prefix (void)
 {
     int        len, result;
-    char buffer[BUFSIZ];
+    unsigned char buffer[BUFSIZ];
     FILE *in;
 
     if ((in = fopen (tmpfil, "r")) == NULL)