Qt 4 is not supported.
Qt 5.5.1 LTS is supported for PowerPC only.

For Android, MacOS, and Windows, the newest Qt LTS is required.

> qmake -o Makefile biblioteq.platform.pro
> gmake or make or mingw32-make
> gmake install or make install or mingw32-make install

MacOS Intel

A. Install the newest Qt LTS via Qt's online installer.
B. https://formulae.brew.sh/formula/libpq
C. > qmake -o Makefile biblioteq.macos.pro
   > make
   > make dmg
