The packaging for libpsl splits out psl-make-dafsa in order to avoid a
cyclic build-dependency, which would make bootstrapping a debian
architecture harder than it needs to be.

publicsuffix will build-depend on psl-make-dafsa so that publicsuffix
can ship a compressed, rapid-access version (DAFSA) of
public_suffix_list.dat alongside the standard text version.

but libpsl itself build-depends on publicsuffix.  We avoid the
circularity by ensuring that libpsl's arch-independent build can be
done without publicsuffix.

So the path to bootstrapping should be:

 * arch-independent build of libpsl (creates psl-make-dafsa)
 * full build of publicsuffix (creates publicsuffix)
 * arch-dependent build of libpsl (creates normal libpsl* packages)

 -- Daniel Kahn Gillmor <dkg@fifthhorseman.net>, Thu, 14 Jul 2016 01:08:55 +0200