If you are using MMA on an RPM based Linux system (e.g., Fedora) here are the necessary files to build your own kit.
Contents of the zip:
rpmbuild/SPECS/mma.spec
rpmbuild/SOURCES/mma-devl.12.10a-paths.patch
rpmbuild/SOURCES/mma-devl.12.10a-player.patch
Just add the recently released mma-devl.12.10a.tar.gz in rpmbuild/SOURCES and build ahead...