How to increase the 16 argument limit in PLpgsql

Hi,
I saw in a previous post that you can, at compile time, increase the
number of arguments you can pass to a PLpgsql function:
http://faqchest.dynhost.com/prgm/pgsql-l/pgsql-01/pgsql-0102/pgsql-010224/pg
sql01021013_21539.html
Unfortunately they didn't say how to do it.

Could anyone tell me if its possible or indeed advisable to increase the
argument count, and if it is, how to do it.

Many thanks,

David Morgan.

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