gimp-app fails to install after compile

[Bob Melson]

As previously reported, gimp-app fails to install, with the following
error message:

Installing gimp-app-2.10.6_1,1...
pkg-static: Fail to create temporary file:
/usr/local/libexec/gimp/2.2/plug-ins/wavelet-decompose/.wavelet-decompose.Hk8ZNt9e18Zg:Not
a directory
*** Error code 70

pkg upgrade gimp-wavelet-decompose-plugin also fails with a similar
error message:  pkg: Fail to create temporary file:
/usr/local/libexec/gimp/2.2/plug-ins/wavelet-decompose/.wavelet-decompose.tnl2CJ43U8Ex:Not
a directory

uname -a:  FreeBSD strider.rgmhome.net 11.2-RELEASE-p4 FreeBSD
11.2-RELEASE-p4 #1 r339445: Sat Oct 20 12:19:18 MDT 2018
root at strider.rgmhome.net:/usr/obj/usr/src/sys/GENERIC  amd64

This failure prevents upgrading of py(27)-gimp.

The error message suggests that the error is in the wavelet-decompose
plugin and that the fix should be relatively simple but I'm not
comfortable attempting it for myself as I've been away from the
nitty-gritty of makefile and autoconf "programming" for too long.

Anything you might be able to do - or even a friendly dope-slap - would
be appreciated.

Thanks
-- 
Robert G. Melson | Rio Grande Microsolutions | El Paso, TX
--
Minds are like parachutes.  They only function when they
are open.  Sir James Dewar