title: pyconfig-64.h: No such file or directory
body: <p>I have a newish Slackware 14.1 64-bit install (Python 2.7.5), and am trying to install pygraphviz via pip.</p>
  
  <p>When I run:</p>
  
  <pre><code>pip install pygraphviz
  </code></pre>
  
  <p>however, I get the following error:</p>
  
  <pre><code>In file included from /usr/include/python2.7/Python.h:8:0,
                   from pygraphviz/graphviz_wrap.c:124:
  /usr/include/python2.7/pyconfig.h:6:25: fatal error: pyconfig-64.h: No such file or     directory
   #include "pyconfig-64.h"
                       ^
  compilation terminated.
  error: command 'gcc' failed with exit status 1
  </code></pre>
  
  <p>The referenced pyconfig.h file is:</p>
  
  <pre><code>#include &lt;bits/wordsize.h&gt;
  
  #if __WORDSIZE == 32
  #include "pyconfig-32.h"
  #elif __WORDSIZE == 64
  #include "pyconfig-64.h"
  #else
  #error "Unknown word size"
  #endif
  </code></pre>
  
  <p>Looking around, there is a lot of info for missing a pyconfig.h file, but not the 64 variant, and I'm struggling to find the package to install to take care of this. I tried to use rpm2tgz and the python-devel rpm for 2.7.5 from Fedora, but it didn't take care of the issue. Also, as I'm running slack, a yum or apt-get command isn't a valid solution, I need to know where I can find the actual package. </p>