[Bug 21174] cmd does not support /a arithmetic expression evaluation

http://bugs.winehq.org/show_bug.cgi?id=21174

--- Comment #4 from Dan Kegel   2010-01-23 09:07:21 ---
(Incidentally, webcore_bindings_sources_rules.mk terminates early
when run with -j2.  Each time you run it, it generates a few more
output files.  Running with -j1 or without -j works around that.
But that's a different bug.)