Executing scripts during configure

[Michael Franz]

>
> Add a pre-configure phase which finds those files and generates the
> string/path that you want to pass to configure, put it in a portfile-
> local variable and then add it to your configure args by using that
> variable.
>

Any hints on how to do this?  I have not found many examples.  The one that
I did find uses perl.

These don't cause a problem, but doesn't work.  libgcj is not defined when
configure executes.

set libgcj [ open find ${prefix}/share/java -name "libgcj-4\.2*.jar"]
set libgcj system find ${prefix}/share/java -name "libgcj-4\.2*.jar"
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