You can use patch https://en.wikipedia.org/wiki/Patch_(Unix). You can open patch as text and merge it manualy as well. Patch has been produced by diff https://en.wikipedia.org/wiki/Diff_utility. And then you should build it.
Updated version is here: https://sourceforge.net/p/tuxguitar/patches/28/
8 and 9 string guitars support
I'm going to update this patch next week. New version will contain changes for android...
Hello, Fortunately, TuxGuitar project is alive. Have you downloaded "tuxguitar-1.3.0-src.tar.gz"?...
Hello, I have some ideas related to scales functionality. I think it should be improved....