We’re unable to trigger the issue here, but invoking make in a new instance of cmd.exe might be a workaround.
Could you try making a little adjustment in build.bat and see if that fixes the problem?
The original file should be located here: C:\ProgramData\Uno\Packages\UnoCore\0.1.0\Targets\CPlusPlus\Android\build.bat
Change line 32 to this: cmd /c %MAKE% -j %NUMBER_OF_PROCESSORS% || goto ERROR
I didn’t help… I did check that it propagated correctly to the .bat file that was executed. Some posts on the internet speculate that it has to do with gmake and a cygwin dll-file… are you using such things?