title: Ubuntu Python: unable to pip install dlib - Failed building wheel for dlib and machine is almost stuck
body: <p>I am trying to install dlib (machine learning library) for my django python environment. however, i cant get it installed. there is error and stuck.</p>
  
  <p>based on this instruction, this is what I did <a href="https://www.pyimagesearch.com/2017/03/27/how-to-install-dlib/" rel="nofollow noreferrer">https://www.pyimagesearch.com/2017/03/27/how-to-install-dlib/</a></p>
  
  <pre><code>$ sudo apt-get install build-essential cmake
  $ sudo apt-get install libgtk-3-dev
  $ sudo apt-get install libboost-all-dev
  
  $ source somedotcomenv/bin/activate &lt;-- virtualenv
  
  $ pip install numpy
  $ pip install scipy
  $ pip install scikit-image
  $ pip install dlib
  </code></pre>
  
  <p>however, it failed and i think stuck, its almost an hour at the last stage. Im not sure if its still compiling or not. </p>
  
  <pre><code>  [ 82%] Building CXX object CMakeFiles/dlib_.dir/src/dlib.cpp.o
    In file included from /usr/include/boost/python/detail/prefix.hpp:13:0,
                     from /usr/include/boost/python/args.hpp:8,
                     from /usr/include/boost/python.hpp:11,
                     from /tmp/pip-build-8xkp8e7q/dlib/tools/python/src/dlib.cpp:4:
    /usr/include/boost/python/detail/wrap_python.hpp:50:23: fatal error: pyconfig.h: No such file or directory
    compilation terminated.
    CMakeFiles/dlib_.dir/build.make:62: recipe for target 'CMakeFiles/dlib_.dir/src/dlib.cpp.o' failed
    make[2]: *** [CMakeFiles/dlib_.dir/src/dlib.cpp.o] Error 1
    CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/dlib_.dir/all' failed
    error: cmake build failed!
  
    ----------------------------------------
    Failed building wheel for dlib
    Running setup.py clean for dlib
  Failed to build dlib
  Installing collected packages: dlib
    Running setup.py install for dlib ... 
  </code></pre>
  
  <p>full execution and error logs here <a href="https://gist.github.com/axilaris/fe58937e8ac39386e6e9816833636461" rel="nofollow noreferrer">https://gist.github.com/axilaris/fe58937e8ac39386e6e9816833636461</a></p>
  
  <p>This is the last top process, its stuck not sure its still compiling but its already been an hour. something is stuck. very slow even trying to type something on another command line.</p>
  
  <pre><code>PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND                                                                                      
     30 root      20   0       0      0      0 S  9.2  0.0   6:21.82 kswapd0                                                                                      
   4550 deploy    20   0   95372    980      0 S  0.3  0.1   0:01.59 sshd                                                                                         
   4566 deploy    20   0  184852  14756    684 D  0.3  1.5   0:04.70 gunicorn                                                                                     
   4934 deploy    20   0  256084  15712     28 D  0.3  1.5   0:10.05 python3                                                                                      
   5646 deploy    20   0  757604 567016      0 D  0.3 55.9   0:29.41 cc1plus                                                                                      
   5770 postgres  20   0  294548   4808   2344 D  0.3  0.5   0:00.23 postgres                                                                                     
   5773 postgres  20   0  294384   4648   2244 D  0.3  0.5   0:00.17 postgres                                                                                     
   9531 root      20   0  280224   8360      0 S  0.3  0.8   1:06.10 snapd  
  </code></pre>
  
  <p>I am using AWS ubuntu-xenial-16.04-amd64-server-20171026.1 (ami-da05a4a0)</p>