The following commit appears to have broken -daemon mode for a bitcoind compile:

8314b7f is the first bad commit
commit 8314b7f
Author: Matt Giuca matt.giuca@gmail.com
Date: Sat Feb 26 08:58:15 2011 +1100

makefile.unix: Removed redundant use of wx-config in DEFS (it was being included twice).
    Also changed wx-config --cppflags to --cxxflags. I am not sure what the
    difference is supposed to be, but --cppflags does not include -pthread.

:100644 100644 b36aa2c6a8cb4b6a22f053eccf70c88217d2f445 383de9aded37750f1f7cff5290c4dfab40545f09 M makefile.unix