Removing --prefix from args to configure

[Joshua Root]

On 2016-7-17 16:02 , Watson Ladd wrote:
> Dear all,
> ChezScheme takes installprefix, not prefix as an arg, and having
> prefix confuses it. I don't understand how to remove this unwanted
> argument as I never put it in in the first place. I think once I have
> this the portfile will be done.
> Sincerely,
> Watson

Change configure.pre_args to what you need. Like many options, it has a 
default value that works in a lot of cases. 
<https://guide.macports.org/#reference.phases.configure>.

- Josh