How to add GPAC(MP4Box) library to Qt project?

Question

I am using Qt 5.11 and Mac OS (High Sierra). Trying to add GPAC (MP4Box), I compile the library downloaded from Git and then include its path in the .pro file like this:

LIBS +=   -L"/Users/stellar/Desktop/gpac/bin/gcc"
LIBS +=   /Users/stellar/Desktop/gpac/include

Then I include a header file in main.cpp:

#include<gpac/avparse.h>

Doing that I get the following error:

"/Users/stellar/Desktop/gpac/include/gpac/configuration.h:163: error: "Unknown target platform used with static configuration file"

How to fix that?