There's a patch in log4cxx's tickets/DM-2581 branch.
This builds fine on my laptop (OS X Yosemite) & on lsst-dev. However, on Yosemite I get quite a few failures in the test suite, most notably a segfault in streamtestcase. I note that we don't actually run the tests because they are too unreliable and that there's an upstream issue regarding segfaults in this test, so I don't know how much to worry about this. I don't intend to burn more time debugging this package unless we know there's a problem.
Also: I don't know how eupspkg applies patches. I guessed following the examples that are already there, but I might've screwed up. Hopefully it's an easy tweak if so,