Don't keep generated parser/scanner files in the source dir
Were using bison 3 for a best quality. See https://phabricator.kde.org/D357.
We will have to wait until Bison 3 is a mainstream.
It's potentially available on windows (not officially): https://github.com/lexxmark/winflexbison. Also not all Linuxes have this bison version.
Update (Feb 2018): winflexbison is 3.0.4 now (see [[https://phabricator.kde.org/source/craft-blueprints-kde/browse/master/dev-util/winflexbison/winflexbison.py|here]]) so there's chance for Windows support.