brew tap houmain/tap
brew install --HEAD keymapper
✔︎ JSON API formula.jws.json                                                              Downloaded   31.9MB/ 31.9MB
✔︎ JSON API cask.jws.json                                                                 Downloaded   15.3MB/ 15.3MB
==> Fetching downloads for: keymapper
✔︎ Formula keymapper (HEAD-74adad9)
==> Installing keymapper from houmain/tap
 ==> cmake -B build -DHOMEBREW_ALLOW_FETCHCONTENT=ON
Last 15 lines from /home/jon/.cache/Homebrew/Logs/keymapper/01.cmake.log:
    	from /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/shims/linux/super/g++-14:578:in '<main>'
    make[1]: *** [CMakeFiles/cmTC_ed9ed.dir/build.make:81: CMakeFiles/cmTC_ed9ed.dir/testCXXCompiler.cxx.o] Error 1
    make[1]: Leaving directory '/var/tmp/keymapper-20260214-30967-sm3xwn/build/CMakeFiles/CMakeScratch/TryCompile-f8QbYG'
    make: *** [Makefile:134: cmTC_ed9ed/fast] Error 2





  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
  CMakeLists.txt:2 (project)


-- Configuring incomplete, errors occurred!

If reporting this issue please do so at (not Homebrew/* repositories):
  https://github.com/houmain/homebrew-tap/issues

keymapper's formula was built from an unstable upstream --HEAD.
This build failure is expected behaviour.