Make sure you have Qt installed, then either do it yourself with the following commands:
git clone https://github.com/urbanij/syRF-cpp.git
cd syRF-cpp
cd syRF
mkdir build && cd build
qmake ..
make
or use Qt Creator.
Run it by, e.g., simply launching ./syRF.app/Contents/MacOS/syRF
or just double click on the syRF.app
.