title: how to fix "Error refreshing Makefiles" error in veins?
body: <p>I was using an old version of veins in my work (version 4.5) with omnet++ version 5 and SUMO 0.29.0. It was working without problems.</p>
  
  <p>now I want to upgrade to a newer version of veins. I tried both 4.7 and 4.7.1 with the same versions of SUMO and Omnet++. while building the project I get the following error:</p>
  
  <p>Error refreshing Makefiles.</p>
  
  <p>Reason:</p>
  
  <p>Cannot parse /veins/.oppbuildspec</p>
  
  <p>Details:</p>
  
  <p>/veins/.oppbuildspec: unrecognized option: --meta:export-include-path</p>
  
  <p>/veins/.oppbuildspec: unrecognized option: --meta:export-include-path</p>
  
  <p>I don't know how to fix the error. I removed the older veins project from the IDE and the workspace.</p>
  
  <p>I am working on Windows 8.</p>