[O] Builds on OSX fails recently

[Neuwirth Erich]

On OSX 10.8.2 with Emacs 24.2.1
when trying
make up2
I get

Ran 334 tests, 333 results as expected, 1 unexpected (2012-12-14 18:29:01+0100)
5 expected failures

1 unexpected results:
   FAILED  test-org-src/blank-line-block

make[1]: *** [test-dirty] Error 1
make: *** [up2] Error 2


Yestereday, building worked without this problem.