ERROR: language "c" is not trusted

I do the following as the user "postgres"

alberts=# CREATE FUNCTION foobar(CSTRING)
alberts-# RETURNS opaque
alberts-# AS '$libdir/mystuff' , 'foobar'
alberts-# LANGUAGE 'c'
alberts-# WITH (isstrict,iscachable);
CREATE FUNCTION

Next I'd like to be able to use the funtion as a "normal" user
so I thy this:

grant USAGE ON LANGUAGE c TO alberts;
ERROR: language "c" is not trusted

OK, now what?

=====
Chris Albertson
Home: 310-376-1029 chrisalbertson90278(at)yahoo(dot)com
Cell: 310-990-7550
Office: 310-336-5189 Christopher(dot)J(dot)Albertson(at)aero(dot)org
KG6OMK

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