From Ted Ross:

"Looking at the qpidc package, it appears that it has dependencies on xqilla and
xerces.  Surely this is an error, is it not?"

From Matt Farrellee:

"configure.ac checks for xqilla and xerces-c with AC_LIB_CHECK, so if they are
found -lxqilla and -lxerces-c will be used on all link lines. Now, we're
building in brew so no extra xqilla or xerces-c libraries should be installed,
but they are installed because qpidd is built from the same spec as qpidc and it
requires them.

The solution to this may be to not just throw -lxqilla etc (likely same issue
with -lsasl2) in LIBS, but to keep them separate and only use them when building
a binary that needs them. There must be a simpler solution though."