[lxml] wrong ELF class

Hello, I am running SUSE 12.3 on an AMD-64 System. I have installed python-lxml-2.3.4-6.1.1.x86_64.rpm When lxml gets called from gnuradio-companion I get the following error-message: ImportError: /usr/lib/python2.7/site-packages/lxml/etree.so: wrong ELF class: ELFCLASS32 Could it be possible, that the architecture in the RPM does not match 64-Bit (despite it's name)? How can I check? How can I get a working python-lxml for my system? Thanks Wolfgang