Fixed.
The option has been removed from SlackBuild for PHP 8.3.1
It can be checked with the command:
php -i|grep Thread
Source:
https://www.geeksforgeeks.org/what-i...d-safe-in-php/
ZTS (Zend Thread Safety) is a requirement for parallel
https://www.php.net/manual/en/parallel.setup.php
Parallel installation is done from PECL, but at the moment there is no support for PHP 8.3.1
https://pecl.php.net/package-changel...&release=1.2.1
Thread closed.