Well, as it happens, an update to Xcode was released tonight, so I tried compiling 0.224 from scratch, and I got the same error:

Code
Compiling src/emu/video/rgbgen.cpp...
Compiling src/emu/video/rgbsse.cpp...
Compiling src/emu/video/rgbvmx.cpp...
Compiling src/emu/xtal.cpp...
Compiling src/emu/rendfont.cpp...
Compiling src/emu/rendlay.cpp...
Archiving libemu.a...
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../../../../osx_clang/bin/x64/Release/libemu.a(rgbgen.o) has no symbols
/Library/Developer/CommandLineTools/usr/bin/ranlib: file: ../../../../osx_clang/bin/x64/Release/libemu.a(rgbvmx.o) has no symbols
make: *** [macosx_x64_clang] Error 2
iMac-2:mame0224s dave$ 


Is this something easily fixable?


The following statement is true...
The preceding statement is false.