Update extensions/ringlibui/buildclang.sh
-clang -c -fpic -O2 ring_libui.c -I $PWD/../../language/include -I /usr/local/include
+clang -c -fpic -O2 ring_libui.c -I $PWD/../../language/include -I /usr/local/include -I macOS
clang -dynamiclib -o $PWD/../../lib/libring_libui.dylib ring_libui.o macOS/libui.dylib -L $PWD/../../lib -lring
