To avoid freeness issues etc., I would be very happy if there were a variant of the Pike source tarball without bundled libraries. From debian/copyright:
The upstream tarball has been repacked without the 'bundles' subdirectory, which contains redundant copies of some libraries, to avoid shipping some non-DFSG-compliant bits (see the gmp package) and having to include the copyright information and licenses of those libraries.
In any case, why is there both a libffi-3.0.4.tar.gz and its unpacked contents?