append_path PKG_CONFIG_PATH /usr/local/lib/pkgconfig
append_path PKG_CONFIG_PATH /usr/local/cross/lib/pkgconfig
append_path PKG_CONFIG_PATH /opt/local/lib/pkgconfig
append_path PKG_CONFIG_PATH /usr/local/lib/pkgconfig
append_path PKG_CONFIG_PATH /usr/local/cross/lib/pkgconfig
append_path PKG_CONFIG_PATH /opt/local/lib/pkgconfig