Stefan H. Muller has been working hard to expand cpyext enough so that matplotlib non-interactive backends can work with PyPy. The steps to get it all working are included[0]. While pypy translates for him (on MacOS I think), I could not get past the platform checks on linux 64. If anyone would like to help, the branch is pypy-pyarray and the author is Stefan__ on IRC (off work hours). The traceback is here http://buildbot.pypy.org/builders/pypy-c-jit-linux-x86-64/builds/1602/steps/... the last lines are [translation:ERROR] CompilationError: CompilationError(err=""" [translation:ERROR] /tmp/usession-pypy-pyarray-0/platcheck_35.o: In function `PyComplex_FromCComplex': [translation:ERROR] platcheck_35.c:(.text+0x13): undefined reference to `_PyComplex_FromCComplex' Matti [0] Matplotlib on pypy 0. hack numpypy to implement __version__ and get_include() 1. build pypy from pypy/pypy-pyarray branch 2. install it into a virtualenv 3. download and install rlamy's pypy-hack https://github.com/rlamy/numpy/tree/pypy-hack 4. donwload and install stefan's matplotlib https://github.com/shmuller/matplotlib 5. use a non-interactive backend Matti