Can't build devel/autoconf on NetBSD/amd64 6.1.5

[Marc Baudoin <babafou%babafou.eu.org@localhost>]

Hi,

I can't get devel/autoconf to build on NetBSD/amd64 6.1.5 with an
up to date pkgsrc tree:

Making all in man
Updating man page ./config.guess.1
PATH="../tests:../build-aux:$PATH";  export PATH;  /bin/sh /usr/pkgsrc/devel/autoconf/work/autoconf-2.69/build-aux/missing --run help2man  --include=./config.guess.x  --include=./common.x --source='GNU Autoconf 2.69'  --output=./config.guess.1.t `echo './config.guess' | sed 's,.*/,,'`
help2man: can't get `--help' info from config.guess
Try `--no-discard-stderr' if option outputs to stderr
*** Error code 1

Stop.
make: stopped in
/usr/pkgsrc/devel/autoconf/work/autoconf-2.69/man
*** Error code 1

Stop.

Did I do something wrong or is it a problem with the package?