/usr/lib/gcc-cross/m68k-linux-gnu/ is in libobjc-5-dev-m68k-cross 5.3.1-14ubuntu2cross1.
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/usr/lib/gcc-cross/m68k-linux-gnu/5/
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/NXConstStr.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/Object.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/Protocol.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/message.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/objc-decls.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/objc-exception.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/objc-sync.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/objc.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/runtime.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/include/objc/thr.h
/usr/lib/gcc-cross/m68k-linux-gnu/5/libobjc.a
/usr/lib/gcc-cross/m68k-linux-gnu/5/libobjc.so
/usr/lib/gcc-cross/m68k-linux-gnu/5/libobjc_gc.a
/usr/lib/gcc-cross/m68k-linux-gnu/5/libobjc_gc.so