Bug#763523: pypoker-eval: Standards-Version from the Future (or Standards-Version mixed up with debhelper compatibility)
the Standards-Version field of your source package contains the value
"5", but the newest Debian Policy release is only at 3.9.6. So you seem
to know about Debian Policies from the future… :-)
I suspect you mixed up the debhelper compatibility from debian/compat (4
in your case, but it build-depends on debhelper >= 5.something) with the
Standards-Version field which declares compliance with the given version
of the Debian Policy.