Hi, I have installed libvirt via Homebrew = compiled from source <https://github.com/Homebrew/homebrew/blob/master/Library/Formula/libvirt....;. Then I wanted to install *ruby-libvirt* gem install ruby-libvirt and end up with this error: /usr/local/Cellar/ruby/2.1.2_3/bin/ruby extconf.rb *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/usr/local/Cellar/ruby/2.1.2_3/bin/ruby --with-libvirt-include --without-libvirt-include --with-libvirt-lib --without-libvirt-lib --with-libvirt-config --without-libvirt-config --with-pkg-config --without-pkg-config extconf.rb:73:in `<main>': libvirt library not found in default locations (RuntimeError) extconf failed, exit code 1 so then I passed the locations of *include* & *lib* directories as the configuration options: gem install ruby-libvirt -- --with-libvirt-include=/usr/local/Cellar/libvirt/1.2.7/include --with-libvirt-lib=/usr/local/Cellar/libvirt/1.2.7/lib which *worked*, but it's not very clean and effective solution, especially if you have *ruby-libvirt* as a requirement in your Gemfile and you need to install it via Bundler. I reckon that a possible solution would be to change Homebrew formula, so that it either installs or symlinks both dirs into locations where *ruby-libvirt* will look for it, but *_what's the default location actually_*?