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Checking for DocBook being installed was valuable when we were on the OpenSP docs toolchain, because that was rather hard to get installed fully. Nowadays, as long as you have xmllint and xsltproc installed, you're good, because those programs will fetch the DocBook files off the net at need. Moreover, testing this at configure time means that a network access may well occur whether or not you have any interest in building the docs later. That can be slow (typically 2 or 3 seconds, though much higher delays have been reported), and it seems not very nice to be doing an off-machine access without warning, too. Hence, drop the PGAC_CHECK_DOCBOOK probe, and adjust related documentation. Without that macro, there's not much left of config/docbook.m4 at all, so I just removed it. Back-patch to v11, where we started to use xmllint in the PGAC_CHECK_DOCBOOK probe. Discussion: https://postgr.es/m/E2EE6B76-2D96-408A-B961-CAE47D1A86F0@yesql.se Discussion: https://postgr.es/m/A55A7FC9-FA60-47FE-98B5-139CDC57CE6E@gmail.com
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.