Instead of generating IOHandler.h, we're now generating IOHandler.cc. Reason: If we generate IOHandler.h the includes of the plugins (e.g. CosmoXMLIO) will be included by every project that requires MeteoIO.h, thus XML library includes, etc will be necessary in every project that includes MeteoIO.h ;( By generating IOHandler.cc and putting the includes of the plugins there this situation can be averted.