jom does not ignore errors in commands prefixed with -

To reproduce, create this Makefile:

first:
        -nonexistent_command
        @echo Failing command was properly ignored

Try mingw32-make, nmake, gmake or make and observe that "Failing command was properly ignored" is echoed, and the command has an errorlevel of 0.

Try jom and observe that it incorrectly aborts when nonexistent_command fails.