Problems building pkgin on NetBSD 7/8

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

Anyone else seeing this:

checking for library containing socket... none required
checking for library containing inet_addr... none required
checking for strlcpy in -lnbcompat... yes
checking for library containing fetchGetURL... no
configure: error: libfetch not found.
*** Error code 1

libfetch IS installed. The .a is in /usr/pkg/lib and pkgsrc itself says:

=> Build dependency libfetch>=2.39nb1: found libfetch-2.39nb1
=> Build dependency cwrappers>=20150314: found cwrappers-20180325
=> Full dependency pkg_install>=20130901: found pkg_install-20191008nb1
=> Full dependency openssl>=1.1.1dnb2: found openssl-1.1.1dnb2
===> Overriding tools for pkgin-0.15.0nb1

My chroot package builds using libkver have started reporting this on 
Both 7.2 and 8.1 amd64. Build host is actually 9.0-RC1 and building 
pkgin for the native 9.0-RC1 amd64 work fine.

This isn't the only library I'm seeing issues with. cmake is unable to 
find the base heimdal (in an 8.1 libkver chroot).

Mike