This is simply a spec file for building an RPM for znapzend.
Make sure the Version field is set to the latest release for znapzend.
(Check the znapzend releases page if you're not sure.)
Download the corresponding tarball. If you have spectool installed (in
the rpmdevtools package on RHEL/Fedora systems), that's simply:
spectool -g -R znapzend.spec
Use the spec file to build the RPM. With rpmbuild, that's:
rpmbuild -ba znapzend.spec