Thanks Ponce
I applied the patch and the slackbuild it created worked.
Although the patch command puzzles me here is what it did.
bash-4.4# patch libgme.SlackBuild libgme_61.patch
patching file libgme.SlackBuild
patching file libgme.SlackBuild
Hunk #1 FAILED at 1.
1 out of 1 hunk FAILED -- saving rejects to file libgme.SlackBuild.rej
bash-4.4# cat libgme.SlackBuild.rej
--- libgme.info
+++ libgme.info
@@ -1,8 +1,8 @@
PRGNAM="libgme"
-VERSION="0.6.0"
+VERSION="0.6.1"
HOMEPAGE="https://bitbucket.org/mpyne/game-music-emu/wiki/Home"
-DOWNLOAD="https://bitbucket.org/mpyne/game-music-emu/downloads/game-music-emu-0.6.0.tar.bz2"
-MD5SUM="b98fafb737bc889dc65e7a8b94bd1bf5"
+DOWNLOAD="https://bitbucket.org/mpyne/game-music-emu/downloads/game-music-emu-0.6.1.tar.bz2"
+MD5SUM="d399f4a00aece2813e777dface2b6aab"
DOWNLOAD_x86_64=""
MD5SUM_x86_64=""
REQUIRES=""
I guess that is how it is supposed to work?