MAMEWorld Forums - MAMEUI & IV/Play - Problems Compiling 0.188

I tried compiling the updated release version of MAMEUI64 (including the latest update to "Fix crash in newui" using the standard compiling tools that I've been using for a while now.

I get this error message:

Code:

Compiling src/osd/winui/directories.cpp...
../../../../../src/osd/winui/directories.cpp: In function 'void UpdateDirectoryList(HWND)':
../../../../../src/osd/winui/directories.cpp:230:7: error: use of an operand of type 'bool' in 'operator++' is deprecated [-Werror=deprecated]
  b_res++;
       ^~
cc1plus.exe: all warnings being treated as errors
osd_messui.make:1591: recipe for target '../../../../mingw-gcc/obj/x64/Release/osd_messui/src/osd/winui/directories.o' failed
make[2]: *** [../../../../mingw-gcc/obj/x64/Release/osd_messui/src/osd/winui/directories.o] Error 1          
makefile:19: recipe for target 'osd_messui' failed
make[1]: *** [osd_messui] Error 2
makefile:993: recipe for target 'windows_x64' failed
make: *** [windows_x64] Error 2

Thoughts?