sip-qt4: build.without? "python@2"
sip-qt4: build.without? "python@2"

credits to @arkanoid87
https://github.com/OSGeo/homebrew-osgeo4mac/commit/70fbb00261fd9986dc2d94d0c6da373bf3e958e4#r28528298
OSGeo/homebrew-osgeo4mac,OSGeo/homebrew-osgeo4mac,OSGeo/homebrew-osgeo4mac