We're currently using PostgreSQL 9.2 in our production database, we want to migrate to a new RDS instance, using PostgreSQL 9.4. However, we need to have permission to create a function, but only superuser can create functions on RDS and my user can't be granted as superuser.

CREATE FUNCTION crosstab50(text, OUT rownumber integer, OUT c1 text,...) 
    RETURNS SETOF record 
    LANGUAGE c 
    STABLE STRICT 
    AS '$libdir/tablefunc', 'crosstab';

But we're getting this error during our restore operation:

ERROR:  permission denied for language c