fallback on zmq=/usr/local if default build fails #184
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This tweaks setup.py to fallback on
--zmq=/usr/local
if the initial zmq test fails. I have confirmed that this fixes unconfigured build on CentOS with current distribute/pip/cython. The following command successfully installs pyzmq on this system:despite the fact the CentOS makes the terrible choice to exclude /usr/local/lib from LD_LIBRARY_PATH by default.
See discussion in #128 for details.