title: fatal error: 'Eigen/Core' file not found
body: <p>Well... I have tried the opensource project(<a href="https://github.com/seanbell/intrinsic" rel="nofollow noreferrer">https://github.com/seanbell/intrinsic</a>) several weeks...
  But when I make this file, then it show the error.
  I have installed the eigen, opencv, numpy. The error still happene </p>
  
  <pre><code>python setup.py build_ext -i
  Warning: Extension name 'krahenbuhl2013' does not match fully qualified name 'bell2014.krahenbuhl2013.krahenbuhl2013' of 'krahenbuhl2013.pyx'
  running build_ext
  building 'krahenbuhl2013' extension
  gcc -fno-strict-aliasing -I/Users/Chen/anaconda2/include -arch x86_64 -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/lib/python2.7/site-packages/numpy/core/include -Iinclude -I/usr/include/eigen3 -I/Users/Chen/anaconda2/include/python2.7 -c krahenbuhl2013.cpp -o build/temp.macosx-10.6-x86_64-2.7/krahenbuhl2013.o
  
  In file included from krahenbuhl2013.cpp:569:
  In file included from /usr/local/lib/python2.7/site-packages/numpy/core/include/numpy/arrayobject.h:4:
  In file included from /usr/local/lib/python2.7/site-packages/numpy/core/include/numpy/ndarrayobject.h:18:
  In file included from /usr/local/lib/python2.7/site-packages/numpy/core/include/numpy/ndarraytypes.h:1816:
  /usr/local/lib/python2.7/site-packages/numpy/core/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: 
        "Using deprecated NumPy API, disable it by "          "#defining NPY_NO_DEPRECATED_API
        NPY_1_7_API_VERSION" [-W#warnings]
  #warning "Using deprecated NumPy API, disable it by " \
   ^
  In file included from krahenbuhl2013.cpp:571:
  In file included from ./include/densecrf_wrapper.h:1:
  In file included from include/densecrf.h:29:
  include/unary.h:28:10: fatal error: 'Eigen/Core' file not found
  #include &lt;Eigen/Core&gt;
           ^~~~~~~~~~~~
  1 warning and 1 error generated.
  error: command 'gcc' failed with exit status 1
  make: *** [all] Error 1
  </code></pre>