title: Installation of re2 module in Python failed
body: <pre><code>i686-linux-gnu-gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv
  -O2 -Wall -Wstrict-prototypes -fPIC -I/usr/include/python2.7 -c src/re2.cpp -o build/temp.linux-i686-2.7/src/re2.o
  cc1plus: warning: command line option ‘-Wstrict-prototypes’ is valid for C/ObjC but not for C++ [enabled by default]
  src/re2.cpp:201:29: fatal error: re2/stringpiece.h: No such file or directory
   #include "re2/stringpiece.h"
                               ^
  compilation terminated.
  error: command 'i686-linux-gnu-gcc' failed with exit status 1
  </code></pre>
  
  <p>I have previously done <code>sudo apt-get install python-dev</code></p>