I'm aware I'm "bumping" a necro thread here, but this is relevant to the topic at hand. As of 227 mame is failing to build on 10.9.

I'm literally at a loss as to what/why it refuses to build. I've tried macports builds of gcc 10.2, gcc 8, clang3.7, clang6.0, clang11.0

I even went to the compiling MAME page and setup my environment exactly like it specifies and used the presented arguments to see if it would get anywhere, and nothing. The most I've got is the tools built, but the mame binary will not build. I've seen errors with bgfx and dear-imgui pop up with different things, builds oob on 10.15 but I've got nothing on 10.9.

Using this command: make -j5 PTR64=1 NOWERROR=1 TOOLS=1 TARGETOS=macosx OVERRIDE_CC=/opt/local/bin/clang-mp-3.7 OVERRIDE_CXX=/opt/local/bin/clang++-mp-3.7 PYTHON_EXECUTABLE=/opt/local/bin/python2.7 ARCHOPTS=-stdlib=libc++

This is what I get for my failure:
make -j5 PTR64=1 NOWERROR=1 TOOLS=1 TARGETOS=macosx OVERRIDE_CC=/opt/local/bin/clang-mp-3.7 OVERRIDE_CXX=/opt/local/bin/clang++-mp-3.7 PYTHON_EXECUTABLE=/opt/local/bin/python2.7 ARCHOPTS=-stdlib=libc++
Clang 6.0 detected
/Applications/Xcode.app/Contents/Developer/usr/bin/make -R --no-print-directory -C build/projects/sdl/mame/gmake-osx-clang config=release64 precompile
Precompiling src/emu/emu.h...
error: invalid value 'c++17' in '-std=c++17'
make[2]: *** [../../../../osx_clang/obj/x64/Release/emu.h.gch] Error 1
make[1]: *** [precompile] Error 2
make: *** [macosx_x64_clang] Error 2

Any ideas guys? This is making me want to pull my hair out!

SDLMAME OSX Intel Builds: http://sdlmame.lngn.net/