Detect version of sed in Makefile

[silverwind]

It's possible to install GNU sed on Darwin or FreeBSD so it's better to not assume BSD sed on those platforms but to instead perform version detection for the GNU string and only use BSD syntax if absent.

[lafriks]

🚀

[techknowlogick]

Not sure this is the way to go. sed --version fails on macOS

[silverwind]

Yeah, BSD sed knows no --version argument but it's no issue as long as there's no GNU string in the output.

$ /usr/bin/sed --version
/usr/bin/sed: illegal option -- -
usage: sed script [-Ealn] [-i extension] [file ...]
       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]

[silverwind]

Switching to perl might be an option but I'm not totally certain that the regex engines are compatible and I think sed is more likely to exist on a given system.