apply a little patch:

bmomjian · bmomjian · commit 3f8e21c34a33 · 2001-05-03T19:20:24.000Z
Oleg Bartunov
diff --git a/src/test/locale/test-ctype.c b/src/test/locale/test-ctype.c
@@ -39,7 +39,7 @@ flag(int b)
 void
 describe_char(int c)
 {
-	char		cp = c,
+	unsigned char		cp = c,
 				up = toupper(c),
 				lo = tolower(c);
 
