for RUNNING gosm you'll need:
libglib2.0-0 2.20.1-1 libgtk2.0-0 2.14.7-5 libcairo2 1.8.6-2+b1 libcurl3 7.18.2-8.1 libpng12-0 1.2.27-2 libwebkit-1.0-1 1.0.1-4+b1 libbz2-1.0 1.0.5 java >=1.5 for PDF-Export
With such ancient dependencies, I wouldn't even try to run it as it seems quite unlikely that the versions available in a current Debian repo will still be able to run it. Or at least try to compile all those dependencies from source. Doing that in a VM of a much older Debian version may be easier as depending on how many dependencies you'd need to compile to even get these, you may have at least some already available. And "Last Update: 2013-04-26" is an overstatement. Something may have changes back then, but the files on Sourceforge haven't been touched since 2009. Under these circumstances, I wouldn't even bother trying to get such ancient software up and running. Not with so many alternatives listed in the OpenStreetMap Wiki [2].
Best
Richard