jom fails to process makefiles (Missing !ENDIF directive.)

I wanted to compile new 7z source (16.04) but jom (newest v1.1.2) failed to process makefiles printing following error:

Error: Missing !ENDIF directive.

I couldn't localize further the issue as there is no way to display any verbose/debug information (it would be good feature anyway even if it was some non-nmake-compatible option like --verbose or --debug for that matter).
Nmake on the other hand does not have any problems. I checked "manually" these makefile and !if/!endif directives seems to be ok. As a general purpose tool jom should be able to handle it or at least signal what it dislikes.

recreating it goes like this: (dl. from source-repo )
\> cd %7z1604-src%\CPP\7zip\Bundles\Alone7z
\> jom

There are quite a few makefiles included along the way and I couldn't grasp which one causes the error.