Documented upstream:

> Note that the test suite looks for the quazip library in the "quazip" folder of the project ("../quazip"), but you may wish to use LIBS for some systems (Windows often puts the library in the separate "debug" or "release" directory). If you wish to use the quazip version that's already installed, provide the appropriate path.
>
> On some systems you may need to set PATH, LD_LIBRARY_PATH or SHLIB_PATH to get "qztest" to actually run.

Can we get a comment to clarify?