title: g++: error: `pkg-config: No such file or directory
body: <p>I installed cygwin and followed this for installation <a href="http://cs.calvin.edu/curriculum/cs/112/resources/installingEclipse/cygwin/" rel="nofollow">http://cs.calvin.edu/curriculum/cs/112/resources/installingEclipse/cygwin/</a></p>
  
  <p>then I run this on my cmd</p>
  
  <pre><code>cd opencv
  cd sources
  cd samples
  cd cpp
  g++ -ggdb `pkg-config --cflags --libs opencv` facedetect.cpp -o facedetect
  </code></pre>
  
  <p>It resulted into this</p>
  
  <pre><code>g++: error: `pkg-config: No such file or directory
  g++: error: opencv`: No such file or directory
  g++: error: unrecognized command line option '--cflags'
  g++: error: unrecognized command line option '--libs'
  </code></pre>
  
  <p>what I'm trying to do is to run facedetect.cpp in opencv to test my classifier any help to fix this issue or provide alternative approach is appreciated </p>