title: Should I be able to compile reactive-banana-wx with "stack build" alone?
body: <p>I cloned <code>reactive-banana</code> and tried to build the <code>reactive-banana-wx</code> example:</p>
  
  <pre><code>git clone http://github.com/HeinrichApfelmus/reactive-banana.git 
  cd reactive-banana/reactive-banana-wx
  stack build
  </code></pre>
  
  <p>There is a <code>stack.yaml</code> in that directory, and it does fetch several packages, but stops with this error:</p>
  
  <pre><code>Progress: 16/20
  --  While building package wxc-0.92.2.0 using:
  
  [snip]
  
      Process exited with code: ExitFailure 1
      Logs have been written to: /home/kostmo/github/reactive-banana/reactive-banana-wx/.stack-work/logs/wxc-0.92.2.0.log
  
      [1 of 1] Compiling Main             ( /tmp/stack5908/wxc-0.92.2.0/Setup.hs, /tmp/stack5908/wxc-0.92.2.0/.stack-work/dist/x86_64-linux/Cabal-1.22.5.0/setup/Main.o )
      Linking /tmp/stack5908/wxc-0.92.2.0/.stack-work/dist/x86_64-linux/Cabal-1.22.5.0/setup/setup ...
      Error: wx-config not found, please install wx-config before installing wxc
  </code></pre>
  
  <p>Is there some other step that must be performed before running <code>stack build</code>?</p>
  
  <p><a href="https://stackoverflow.com/q/34009800/105137">This user</a> seemed to have a related problem.</p>