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According to the Autoconf documentation, there should be a make rule pg_config.h: stamp-h so that with the right setup around this, a change in pg_config.h.in will trigger a rebuild of everything that depends on pg_config.h. But this doesn't always work, sometimes you need to run make twice to get everything up to date after a change of pg_config.h.in. The fix is to write the rule as pg_config.h: stamp-h ; instead (with an empty command instead of no command). This is what Automake-generated makefiles effectively do, so it seems safe to be on this side. It's not actually clear why this is (apparently) more correct. It's been posted to <http://lists.gnu.org/archive/html/help-make/2012-04/msg00058.html> without response so far.
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.