Hello internals, the Zend Engine (the Zend directory in the php-src) had until many versions ago option for a standalone built without PHP extensions, TSRM and other PHP core parts.
Once this was possible: cp -r /path/to/php-src/Zend /path/to/zend-engine cd /path/to/zend-engine ./buildconf && ./configure && make && make install Automake was once part *nix (Linux, macOS...) build system and was later removed from the PHP part. However, today there still exist some files specific to the standalone built of Zend Engine which require Automake and would need some refactoring and refreshments. Maybe even some C code patches to be able to build a fully standalone Zend engine without other php-src files. There is a pull request opened [1] to remove the standalone built of Zend Engine because these files no longer work and they include some obsolete Autoconf macros. To not confuse the end PHP user how to properly build php from source, I think it's best to remove them from tracking in the Git repository. If there is such a case where separate built would be required, a separate project specific files might be a better pick. Either using Autotools (like PHP does) or something else such as CMake. If there are any objections in this regard, let me know please so we don't remove maybe something important from the contextual understanding of the PHP build system itself. Thank you. [1] https://github.com/php/php-src/pull/3694 -- Peter Kokot -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php