Both FLAVORs ( Qt4 and Qt5 ) build fine using `make`, but the Qt5
version won't build on poudriere:
```
CMake Error at /usr/local/share/cmake/Modules/FindQt4.cmake:1313 (message):
Found unsuitable Qt version "5.11.1" from /usr/local/bin/qmake, this code
requires Qt 4.x
Call Stack (most recent call first):
CMakeLists.txt:274 (FIND_PACKAGE)
```
For some reason on poudriere it is ignoring something, and trying to build the
Qt4 version instead.
Please, note:
- the Qt5 version is default upstream
- building the Qt5 version using `make` doesn't ever need:
CMAKE_ARGS+= -DDESIRED_QT_VERSION=5