Upstream hasn't released a source tarball for 0.5.0, so the upstream source
tarball used has been created from the tagged sources in upstream SVN using:

svn checkout svn://svn.code.sf.net/p/sfftools/code-0/sffview/tags/REL0_5_0 sffview-0.5.0
tar --exclude-vcs -Jcvf sffview-0.5.0.tar.xz sffview-0.5.0
