Commit 1af2eea resolves every other target build dependencies, but doesn’t address this issue. As man pages aren’t considered sources in automake, the normal ways to fix this doesn’t apply. I’m not sure how to do this without manually handling man pages rather than letting automake do it for us.
Maybe disable the rules to build the man pages if rst2man isn't found?
Should add a --with-docs flag to configure, but I’m not even sure why these two doc targets are part of the all target. Again, I think they’re inclueded by default because they use the MAN macros which I don’t beleive can be altered without rewriting their install macros too.