Compiling from source, adding latest libgd source

Hello. I am compiling PHP 8.0,1RC1 from source on Ubuntu 20.04LTS. I would like to be able to use the current version of libgd (v2.3.0) instead of the bundled version (v2.1.0 compatible) or the system-installed version (v2.2.5). Is this possible? If I use the --enable-gd flag, PHP 8.0.1RC1 uses the bundled libgd (expected). If I also use the --with-external-gd flag, PHP 8.0.1RC1 uses the system-wide libgd (expected). Is there a way I can compile PHP with the libgd source, or alternatively point the PHP configure / compile process to point to a pre-compiled version of libgd specifically for PHP (e.g. if I compile libgd source to /etc/php/shared/libgd/). Thank you for any insight or feedback. Best wishes, Pete -- Pete Cooper pete@pragmatika.net https://pragmatika.net Please note: my working hours may not be your working hours. Please do not feel obligated to reply outside of your normal work schedule.