Homebrew/homebrew — pull request #28247 by NikolausDemmel (2014-04-08 14:33:57+00:00)
Title: qt5: Remove the saved superenv pkg-config setup.

- Qt saves the pkg-config setup from compile time (PKG_CONFIG_LIBDIR). Remove
this after in `install`. This way pkg-config called from with qmake will be
controlled by the user's setup.
- Adresses second half of https://github.com/Homebrew/homebrew/issues/27184