Urs Liska provides installers for branch master of lilypond, generated by an
updated version of our build system GUB:
https://cloud.ursliska.de/s/QPINwLqJNeVslCu
There you'll find
lilypond-2.21.0-1.darwin-ppc.tar.bz2
lilypond-2.21.0-1.darwin-x86.tar.bz2
lilypond-2.21.0-1.freebsd-64.sh
lilypond-2.21.0-1.freebsd-x86.sh
lilypond-2.21.0-1.linux-64.sh
lilypond-2.21.0-1.linux-ppc.sh
lilypond-2.21.0-1.linux-x86.sh
lilypond-2.21.0-1.mingw.exe
lilypond-2.21.0.tar.gz
Please test if those files provide valid lilypond installations and report
success / failure by replying to this thread if no identical test results
already have been posted.