[Jackaudio] Continuous integration for MacOSX

Hi For MacOSX softwares, Using Github, the packaging instruction had been simply "brew install jack" ( rather than apt-get install -y libjack- jackd2-dev" ) It worked in the past. After a modification, I am having now the problem of the dev not found (can not find the file <jack/jack.h>. I can not see why the modification disrupts. I have only added one more variable to the make command. Regards Patrick