Edit zint-1.6.pro and edit the 'DEFINES'  section
    NO_PNG -> compile zint without png support
    NO_QR -> compile zint without QR support
    QR_SYSTEM -> if you have QT installed in your system, zint will be compiled with QT support
    QR -> compile zint with QR support static (you must have qrencode in the current folder)

Edit compile_n_config and set the paths.

Exec compile_n_config