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extend/ENV/super: set M4 for libtool

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[g]libtoolize looks for m4 using the environment variable M4. When
that isn't set, it looks for m4 in PATH.

However, when libtool is a build dependency but m4 is not, m4 will
not be found in PATH. Since it is currently not set in the
environment by superenv, this causes some builds to fail.

Closes https://github.com/Homebrew/homebrew-core/pull/73932.
This commit is contained in:
Carlo Cabrera 2021-03-26 14:32:09 +00:00
parent 6362f3ebbf
commit e8452de418
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Library/Homebrew/extend/ENV/super.rb
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@ -74,6 +74,7 @@ module Superenv
self["CMAKE_INCLUDE_PATH"] = determine_cmake_include_path
self["CMAKE_LIBRARY_PATH"] = determine_cmake_library_path
self["ACLOCAL_PATH"] = determine_aclocal_path
self["M4"] = "#{HOMEBREW_PREFIX}/opt/m4/bin/m4" if deps.any? { |d| d.name == "libtool" }
self["HOMEBREW_ISYSTEM_PATHS"] = determine_isystem_paths
self["HOMEBREW_INCLUDE_PATHS"] = determine_include_paths
self["HOMEBREW_LIBRARY_PATHS"] = determine_library_paths