really just use the CI scripts to build ( ... in CI folder ... duh).
Never had your issues. Takes less than 5 mn to build on my mac.
Get the obsdeps zip (url in CI scripts), set the path to qt cmake, mkdir build, either cmake with gui or manually (check the scripts for exact command), make -j4 ... That's it, the obs binary is in rundir folder.
For making a package , the scripts are tailored to build with browser, so either you remove all ref or you specify the path to cef.