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Are you saying OpenGL wasn't on Mac OS before Mac OS X? That's not true. Apple released OpenGL for Mac OS 9 in 1999.

WWDC 1999: Mac OS 9 - A work in progress https://youtu.be/LkmSrCsKPLk?t=1360

WWDC 1999 was after NeXT's acquisition, the engine was already rolling, adopting NeXTSTEP features.

Also note that Copland did not have any OpenGL support planned.