check-setup
* guix/build/qt-build-system.scm (check-setup): New function. (%standard-phases): Add as new phase `check-setup before `check. * doc/guix.texi (Build System)[qt-build-system]: Describe the new phase.
* guix/build/qt-build-system .scm (handle-output): Use directory of output, not its name.
* guix/build-system/qt.scm, guix/build/qt-build-system.scm: New files. * Makefile.am (MODULES): Add them. * doc/guix.texi (Buiild systems): Add the new build system.