You must install Player before building Stage. To build Stage with an interactive GUI, which is highly recommended, you must install libRTK before building Stage. Player and libRTK are availabe from the Player/Stage files page:
http://sourceforge.net/project/showfiles.php?group_id=42445Build and install Player and libRTK following the instructions in the packages' README and INSTALL files. Now download thew Stage tarball and unpack it with:
$ tar xzvf Stage-1.2.tgzNow follow the instructions for your release in the top-level README and INSTALL files.