Translations:CompileOnUnix/218/en

If you want to use your system's copy of Pivy, which you most commonly will, then if not on Linux, set the compiler flag to use the correct pivy with -DFREECAD_USE_EXTERNAL_PIVY=1. Using external Pivy became the default for Linux, during development of FreeCAD 0.16, so it does not need to be manually set when compiling this version onwards, on Linux.