/usr/lib/gcc/x86_64-linux-gnu/ is in libobjc-8-dev 8-20180414-1ubuntu2.
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/usr/lib/gcc/x86_64-linux-gnu/8/
/usr/lib/gcc/x86_64-linux-gnu/8/include/
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/NXConstStr.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/Object.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/Protocol.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/message.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/objc-decls.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/objc-exception.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/objc-sync.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/objc.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/runtime.h
/usr/lib/gcc/x86_64-linux-gnu/8/include/objc/thr.h
/usr/lib/gcc/x86_64-linux-gnu/8/libobjc.a
/usr/lib/gcc/x86_64-linux-gnu/8/libobjc.so
/usr/lib/gcc/x86_64-linux-gnu/8/libobjc_gc.a
/usr/lib/gcc/x86_64-linux-gnu/8/libobjc_gc.so