-static u_char screen0[2] = {0,0} ;
-static u_char screen25[2] = {0,0xaa} ;
-static u_char screen75[2] = {0xaa,0xff} ;
-static u_char screen100[2] = {0xff,0xff} ;
+#ifdef HAVE_XMU
+
+static unsigned char screen0[2] = {0,0} ;
+static unsigned char screen25[2] = {0,0xaa} ;
+static unsigned char screen75[2] = {0xaa,0xff} ;
+static unsigned char screen100[2] = {0xff,0xff} ;