--- ../svgalib-1.4.3-old/src/vga.c	2001-05-29 23:37:55 +0900
+++ src/vga.c	2004-10-27 16:13:24 +0900
@@ -1953,7 +1953,7 @@
     };
     __vga_mmap();
 
-    if ((long) GM < 0) {
+    if ((long) GM == -1L) {
 	printf("svgalib: mmap error rrr\n");
 	exit(1);
     }