Step two for me with setting up IDE for Z80 for use in Mac OSX was placing our tools within MacOSX catalog structure. Why bother with it? The point is to have access to our tools like pasmo or zasm, zmakebas from any folder on the computer without playing with disk/path to them, so it should be “within” system path as other system tools.
For me, under MacOSX 10.11.6 worked copying in terminal to /usr/local/bin by typing (i.e. copying pasmo) after changing path to folder containing pasmo file:
sudo cp pasmo /usr/local/bin
then enter the root (administrator) password after being asked.
From this point pasmo can be envoked from any disk location. I did it installing all command tools like pasmo, zasm, zmakebas etc.