Conflicting requirements pkgconf vs pkg_config?

[yancm%SDF.ORG@localhost]

After recently updating my pkgsrc sources, I'm having difficulty updating.

At first I could not install pkgconf because pkg-config was installed.  I
then deinstalled pkg-config and now pkgconf is blocking pkg-config from
installing.

pkg_chk -u output:
# pkg_chk -u
Merging in previous /usr/pkgsrc/pkgchk_update-clarity.homenet.org.conf
devel/pkg-config - pkg-config-0.29 missing
devel/subversion-base - subversion-base-1.9.3nb2 missing
net/samba - samba-3.6.25nb3 missing
pkgtools/pkgin - pkgin-0.9.4nb2 missing
www/serf - serf-1.3.8nb1 missing
[ Install ]
05:35 cd /usr/pkgsrc/devel/pkg-config && /usr/bin/make update
CLEANDEPENDS=yes
===> Resuming update for pkg-config-0.29
=> Bootstrap dependency digest>=20010302: found digest-20160304
===> Installing binary package of pkg-config-0.29
pkg_add: Installed package `pkgconf-0.9.12.20151211nb2' conflicts with
`pkg-config-[0-9]*' when trying to install `pkg-config-0.29'.
pkg_add: 1 package addition failed
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/devel/pkg-config
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/devel/pkg-config
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/devel/pkg-config
*** Error code 1

Stop.
make: stopped in /usr/pkgsrc/devel/pkg-config
** 'cd /usr/pkgsrc/devel/pkg-config && /usr/bin/make update
CLEANDEPENDS=yes' failed
** ** 'cd /usr/pkgsrc/devel/pkg-config && /usr/bin/make update
CLEANDEPENDS=yes' failed

Am I doing something wrong?