Portupgrade -N for gimp-devel : install help

[Bruce Hunter]

I am trying to install graphics/gimp-devel
I have never had an error before with the portupgrade -N command
This is my error:

root at solid# portupgrade -N graphics/gimp-devel/
make: don't know how to make all-depends-list. Stop
** Invalid package name: graphics/gimp-devel: : Not in due form:
<name>-<version>
** Listing the failed packages (*:skipped / !:failed)
        ! graphics/gimp-devel   (invalid package name)
--->  Packages processed: 0 done, 0 ignored, 0 skipped and 1 failed
root at solid#

Anyone have any ideas?
Thanks,
Bruce