Having an issue compiling messui, hoping for some advice Thanks. I am unable to create the ui version, get this error: C:/buildtools/src/mess/scripts/genie.lua:1087: Unsupported value 'messui' for OSD stack traceback: [C]: in function 'error' C:/buildtools/src/mess/scripts/genie.lua:1087: in main chunk [C]: in upvalue 'builtin_dofile' [string "premake = { }..."]:67: in function 'dofile' [string "_WORKING_DIR = os.getcwd()..."]:41: in function '_premake_main' makefile:665: recipe for target 'build/projects/messui/mess/gmake-mingw64-gcc/Makefile' failed make: *** [build/projects/messui/mess/gmake-mingw64-gcc/Makefile] Error 1 My make command: make -j7 TOOLS=1 TARGET=mess OSD=messui PTR64=1 I am using: windows 7 pro 64bit mame .161 source messui .161 source My MESS batch script: assoc .py=Python.File ftype Python.File=C:\buildtools\src\buildtools\vendor\python\python.exe set PATH=C:\buildtools\vendor\mingw64\bin;C:\buildtools\vendor\mingw64\opt\bin make -j7 TOOLS=1 TARGET=mess OSD=messui PTR64=1 I can compile MESS fine by removing OSD=messui and I start fresh [wipe then re-create] for each and every build/build attempt.