Carlo Cabrera 22db7aa516
superenv: set M4 on Linux when bison is a dependency
Bison no longer remembers the path to `m4` as of
Homebrew/homebrew-core#84931. Since superenv does not put runtime
dependencies of build dependences in `PATH`, we now need to help Bison
find `m4` by setting `M4` in the environment.

See also Homebrew/homebrew-core#85260.
2021-09-16 21:11:12 +08:00
..
2020-10-10 14:59:39 +02:00