Date: Sun, 12 Jun 2005 18:38:45 -0700 (PDT)
From: Douglas Morris

I think it took me two weeks to get my ML-1430 fully
working.  I use Gentoo, but the gdi driver is not
available in the Gentoo ebuild package for
ghostscript.
I compiled and installed three versions.  The final
one is ESP GS 8.15 with the gdi driver included.  I
struggled with the
   "Error: /invalidfont in findfont"
just like you said.

I made the changes to GS_LIB_DEFAULT in Makefile.in,
but the changes did not carry over to Makefile.  After
I realized that.  I used ./configure
--with-fontpath=<my font directories>.  Now the
GS_LIB_DEFAULT in Makefile is sane and it works.  For
some reason, I had to compile the paths into GS. 
Using a command line switch like -sFONTPATH or -I did
not work for me.  ??? Argh.