problem with opcodes porting instructions

[Joern Rennecke]

On Mon, Jan 22, 2007 at 03:38:11PM -0500, Frank Ch. Eigler wrote:
> Joern Rennecke <joernr@arc.com> writes:
> 
> > I've tried to follow the instructions in porting.texi, but I always end
> > up with an error:
> > ./desc-cpu.scm:1005:32: Unbound variable: opc-file-path
> 
> According to cgen/cgen-opc.scm, the underlying variable gets set 
> when the "-opc FILE.opc" argument is given to cgen.

Where can I pass this argument in an interactive guile session?