Problems building bind 9.18.1 on FreeBSD

[Borja Marcos]

Hi

Trying to compile bind 9.18.1 on FreeBSD I am stumbling upon a really silly problem. Getting plenty of errors like this 
building the man pages.

building [man]: all source files
updating environment: [new config] 34 added, 0 changed, 0 removed
reading sources... [100%] tsig-keygen                                           

Warning, treated as error:
../../bin/named/named.conf.rst:901:Undefined substitution referenced: "named_conf".
*** Error code 2



I wonder whether I am missing some needed package. Also, is it really necessary to complicate the generation of man pages to
this extent?



Borja.