Solved! For some reason the file /usr/local/src/Math/sage-6.9/local/lib/python2.7/distutils/unixccompiler.py is not behaving fine and it passes the '-R' option to mpicc instead of '-Wl,-R'. When /usr/local/src/Math/sage-6.9/local/lib/python was not in the PYTHONPATH, then python was using the system version of unixccompiler.py and compiled fine, that explains the mystery I wrote about above. All I did to fix the problem, although I know it's not the finest solution, is to replace the hassling occurence of '-R' in unixccompiler.py with '-Wl,-R' and everything worked fine. Gosh, I wish I had back my 4 hours of debugging, but better 4 than 6 :)
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