If you are talking about a bunch of BSD userland, probably the only place that uses BSD extensions and other gnu incompatible non-posix stuff, I think it's pret

If you are talking about a bunch of BSD userland, probably the only place that uses BSD extensions and other gnu incompatible non-posix stuff, I think it's pretty easy to hardwire it to only build with BSD make variants. Who even builds it manually, and how often? The OPs comment was about software in general, and for software in general gnu make is more optimal as a default in 2019, that is unless you have to be standards-compliant.