build-gnuradio

I am running Debian 7 on a system and Debian 8 on two other PC's and a raspberry PI and having no luck on running the build-gnuradio script. All the Debian 8 systems get as far as stating that the version is unsupported and that's it. The Debian 7 system (wheezy) goes through a number of tests before bombing on not being able to execute certain processes but it appears to get farther than any of the Debian 8 (jessie) systems so it appears that Debian 7 is closest. Is there any place in the script to find a version number so as to be sure that this script is the latest version? I would like to try to receive DMR transmissions as well as try some of the other interesting decoding possibilities but so far, nothing but failure to launch. Thanks for any constructive ideas. Martin McCormick