pkg_install fails when archivers/xz is installed

[Jason Bacon <outpaddling%yahoo.com@localhost>]

On CentOS 7, pkg_install is apparently picking up the "base" xz during 
bootstrap:

$ ls /usr/lib64/liblzma.so*
/usr/lib64/liblzma.so  /usr/lib64/liblzma.so.5 /usr/lib64/liblzma.so.5.2.2

Everything is fine until archivers/xz (liblzma.so.5.2.5) gets installed, 
then...

=> Generating post-install file lists
/usr/pkg/sbin/pkg_create: /usr/pkg/lib/liblzma.so.5: version `XZ_5.2.2' 
not found (required by /usr/pkg/sbin/pkg_create)
/usr/pkg/sbin/pkg_create: /usr/pkg/lib/liblzma.so.5: version 
`XZ_5.1.2alpha' not found (required by /usr/pkg/sbin/pkg_create)
*** Error code 1

Looks like an rpath issue, but I'm not sure what the best solution is.

Thanks,

    JB