Hi All,
I'm ensuring that the Spack packager can build m4 on OS X High Sierra. Here's my PR for them: https://github.com/spack/spack/pull/8559 It's a repackaging of a patch from the Homebrew project's m4 recipe, here: https://github.com/Homebrew/homebrew-core/blob/master/Formula/m4.rb#L18-L25 I'm not sure if the issue was reported to you or not, so I am. Thanks, g.