i dont know if this will work but you can download the source sdk base 2007 for mac and im downloading it now so will bms work with this anyone willing to try
i tried it game dosent launch maybe someone can make a way for the game to launch but atleast it appears it the library
If it doesn’t work, just use a wineskin wrapper. Worked fine for me.
Black Mesa has to be compiled for the mac, so no source code, no port.