https://bugs.gentoo.org/show_bug.cgi?id=789747
--- svgalib-1.9.25/gl/driver.c.orig	2021-05-16 13:24:38.937410767 +0300
+++ svgalib-1.9.25/gl/driver.c	2021-05-16 13:24:47.263441562 +0300
@@ -38,9 +38,9 @@
 	    ((c >> 8) & 0xff) << 8 |
 	    ((c >> 16) & 0xff) << 0;
 #else
-	asm("rorw  $8, %0\n"	/* 0RGB -> 0RBG */
+	asm("rorw  $8, %w0\n"	/* 0RGB -> 0RBG */
 	    "rorl $16, %0\n"	/* 0RBG -> BG0R */
-	    "rorw  $8, %0\n"	/* BG0R -> BGR0 */
+	    "rorw  $8, %w0\n"	/* BG0R -> BGR0 */
 	    "shrl  $8, %0\n"	/* 0BGR -> 0BGR */
       : "=q"(c):"0"(c));
 #endif