[Groff] Clean install of groff (cvs): gropdf not in path

[Axel Kielhorn]

Hi!

I wanted to look at the new mom macros and installed groff from cvs.
I was a little surprised that the pdf files in contrib/mom/examples were all 0 
bytes long.

And here is the reason:

GROFF_COMMAND_PREFIX=''; export GROFF_COMMAND_PREFIX; 
PDFMOM_BIN_PATH=/Users/axel/src/groff/src/devices/gropdf; export 
PDFMOM_BIN_PATH; /Users/axel/src/groff/src/devices/gropdf/pdfmom 
-F/Users/axel/src/groff/font -F/Users/axel/src/groff/font 
-M/Users/axel/src/groff/tmac -M/Users/axel/src/groff/tmac -M. 
examples/typesetting.mom >examples/typesetting.pdf

groff: couldn't exec gropdf: No such file or directory

PDFMOM_BIN_PATH is set to call pdfmom.
pdfmom calles gropdf without the PDFMOM_BIN_PATH and fails when gropdf is not 
in $PATH.
If you installed groff with gropdf earlier it is found in $PATH, but the 
version used is not the current version.

When you install groff and call make again, nothing happens since the zero 
length file already exist. You have to delete the pdf files and the stamp and 
remake.

Axel