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Branches before 16 can't be compiled with a C23 compiler (see deprecation warnings silenced by commit f9a56e72, and non-back-patchable changes made in 16 by commit 1c27d16e). Test __STDC_VERSION__, and if it's above C17 then try appending -std=gnu17. The test is done with the user's CFLAGS, so an acceptable language version can also be configured manually that way. This is done in branches 15 and older, back to 9.2, per policy of keeping them buildable with modern tools. Discussion: https://postgr.es/m/87o72eo9iu.fsf%40gentoo.org
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/.