for now I got the OSX GLFW3 target fixed for OSX Mojave and Xcode 10. It isn't Apples preferred solution but should do the job fine for now.
Please unzip the content of the attached file into your targets folder
I noticed some comments in the net, which indicate that Apple has dropped OpenGL in OSX Mojave.
After I had updated my machine and prior to updating to XCode 10, an initial mojo1 test ran succesfully. But I still need to upgrade to Xcode 10 and test mojo1/mojo2.
My gut feeling tells...