My development environment is FreeBSD, OpenBSD and Linux; I am deploying to non-linux unixes only. 99% of the patches I have to do to build systems are one-line

My development environment is FreeBSD, OpenBSD and Linux; I am deploying to non-linux unixes only. 99% of the patches I have to do to build systems are one-liners that explicitly spell out what syntactic sugar the newest feature of gmake/bash supported or that fixes what a linux-only developer considers to be "the standard" (and let's talk real, it's not only "linux-only" anymore, one has to say "this-specific-linux-distro-only"). And that is on top of the fact that it is not about "running the new versions" but actually installing non-standard software.