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awk's equality-comparison operator is "==" not "=". We got this right in many places, but not in configure's checks for supported version numbers of flex and perl. It hadn't been noticed because unsupported versions are so old as to be basically extinct in the wild, and because the only consequence is whether or not a WARNING flies by during configure. Daniel Gustafsson noted the problem with respect to the test for flex, I found the other by reviewing other awk calls.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.