Mike Fulton wrote: > It looks like I should be cloning from branch branch-1.4, and I should be > using > https://git.savannah.gnu.org/git/m4.git/
Definitely, yes. > https://github.com/autotools-mirror/m4.git Why does Github classify the 'branch-1.4' branch as "stale", not as "active"? I have no idea. > For the tarball, which is what I started with, I have been pulling from > https://ftp.gnu.org/gnu/m4/ > Is that the correct location? For releases, that's OK. Since you intend to contribute porting fixes, it's better to work with the snapshot tarballs instead [1][2]; this way, you won't run into issues that have already been fixed, and you will be consuming your own fixes, a week after you have upstreamed them. Bruno [1] https://gitlab.com/gnu-m4/ci-distcheck [2] https://gitlab.com/gnu-m4/ci-distcheck/-/jobs/artifacts/master/raw/m4-snapshot.tar?job=check-optimized