Since this library needs to compile C++ code, installation can be a little more problematic than pure Python packages.
Make sure to [have Cython installed](https://github.com/lucasb-eyer/pydensecrf/issues/62#issuecomment-400563257) or try [installing via conda instead](https://github.com/lucasb-eyer/pydensecrf/issues/69#issuecomment-400639881) if you are getting problems.