> > USE_MOTIF=YES
> 
> The problem is your use of USE_MOTIF in /etc/mk.conf - it's not meant
> for that kind of use.  For example, there is no mention of USE_MOTIF
> in pkgsrc/mk/mk.conf.example, and in the packages(7) manual page,
> under the section: 

The FreeBSD /etc/make.conf (aside:  do these HAVE to be different?) defines
the following:

# If you have Motif on your system, uncomment this.
#
#HAVE_MOTIF=    yes
#
# If the default location of the Motif library (specified below) is NOT
# appropriate for you, uncomment this and change it to the correct value.
# If your motif is in ${X11BASE}/lib, you don't need to touch this line.
#
#MOTIFLIB=      -L${X11BASE}/lib -lXm