I read the bind-9.10-dist-native-pkcs11.patch file from
the Fedora 23 source package (bind-pkcs11-devel).
It changes some path and file names in Makefile's in
order to provide PKCS#11 alternatives to standard bind
names, e.g., named and named-pkcs11.
IMHO it is both a bad idea (*) and something specific
to Fedora, perhaps inherited from the time the native
PCKS#11 support was not available.

(*) it is a bad idea because you MUST NOT have two
different cryptos at the same time. In bind distribs
this is enforced by configure (patched out in Fedora)
and in libraries (fedora has 2 ISC libs (isc and isc-pkcs11),
2 DNS libs (dns and dns-pkcs11). IMHO it should be
the same for the installation, i.e., if you want to have
bind+OpenSSL and bind+PKCS#11 at the same time
you should simply install them at different places
(and put one and only one of these places in your
path specifying environment variables).

In conclusion about the port bug report: it should
not modify the standard bind and if you'd like to
propose it with another name it should be made
explicitly incompatible with the standard bind.