Installation error rpm in mac 10.9.3
The rpm port is rather old (it depends on python 2.5 and perl 5.08 ) and is outdated as per macports mail list in July 2012 (i.e. it was outdated 2 years ago) 


  Note that the rpm port contains the very old version 4.4.9 of the rpm program. Other ports exist that provide newer versions of rpm which you may want to use instead. None of the newer rpm ports have this particular bug.


Looking for new rpm ports by port search rpm shoes the highest port as rpm54 so try sudo port install rpm54

I would note that that latest is the same latest as two years ago I do not know if there is a higher rpm version elsewhere