Looks like this would be something in the environment when imake is run.
On 2011-12-24, Sebastian Reitenbach wrote:
>===> Configuring for transfig-3.2.5ap0
> mv -f Makefile Makefile.bak
> imake -DPorts -DUseInstalled -I/usr/X11R6/lib/X11/config
> make Makefiles
> making Makefiles in fig2dev...
>
===> Configuring for transfig-3.2.5ap0
mv -f Makefile Makefile.bak
imake -DPorts -DUseInstalled -I/usr/X11R6/lib/X11/config
make Makefiles
making Makefiles in fig2dev...
mv -f Makefile Makefile.bak
making Makefiles in fig2dev/dev...
mv -f Makefile Makefile.bak
Imakefile.c:0: unterm