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+GroovyMAME, also known as GroovyUME, is a fork of MAME/UME with greater
+emphasis on CRT monitor support, in order to provide smoother gameplay
+with less input lag than using regular MAME on an LCD screen. GroovyMAME
+is provided as a patch against the standard MAME sources.
+
+GroovyMAME forum: http://forum.arcadecontrols.com/index.php?board=52.0
+
+GroovyMAME patches can be downloaded from:
+
+https://drive.google.com/drive/folders/0B5iMjDor3P__aEFpcVNkVW5jbEE
+
+Get the latest patch that matches the version of MAME. Example:
+
+0182_groovymame_017a.diff
+
+The "0182" is the MAME version, without the dots. The "017a" is the
+GroovyMAME version. You want the .diff file, not the .tar.bz2 or .7z!
+
+Download or copy the .diff file to the SlackBuild's directory and run the
+SlackBuild script. The script will find the .diff, apply it, and update
+the slack-desc to say "This package was patched with GroovyMAME 017a"
+(or whatever the version number really is). You *don't* have to do
+anything about the CRLF line endings, the script will handle that.
+
+If the script seems to be ignoring the .diff file, you probably have a
+.diff for a different version of MAME. Check the version number at the
+start of the filename. Don't try to rename the .diff file to force it
+to apply: the SlackBuild will fail because the patch will fail.
+
+If you have multiple .diff files that match the MAME version, the script
+will try to use the one with the highest GroovyMAME version number. If
+it picks the wrong one, remove the ones you don't want to use.
+
+If all else fails, please contact me by email (yalhcru@gmail.com) or on
+IRC (##slackware or #slackbuilds channel on FreeNode, user Urchlay). I
+won't necessarily be testing each MAME release against each version
+of the GroovyMAME patch for that release, so there might be problems I
+won't know about.