I load the workspace in Xcode 10.2.1 and attempt to build: Yields Error: ld: library not found for -lassimp-fat Noted that there seems to be the following missing static libs: libIrrXML.a libIrrXML-fat.a libassimp-fat.a libassimp.a I cloned and built assimp at the terminal. It produced: libassimp.a libIrrXML.a but didn't produce the multi-architecture -fat versions. If I remove the others and add the non fat versions I get: ld: library not found for -lassimp