title: cmake4eclipse and -D options
body: <p>I have a CMake project (native Linux) which I imported into Eclipse using cmake4eclipse.</p>
  
  <p>The build process includes downloading some sample data which is rarely needed in production use. Currently this step fails (causing the whole build to fail), which is why I would like to skip it in the build.</p>
  
  <p>The build chain supports skipping tis step. Running CMake from the command line, I would simply do <code>-DSAMPLE_DATA=n</code>.</p>
  
  <p>With cmake4eclipse, where would I specify this option? I have tried adding it in Project > Properties > C/C++ Build > CMake, but it takes no effect.</p>