Issue with SDL2 subproject not working with my projects

I'm currently trying to use SDL2 in my projects which are set to use the latest version of Meson and C18 as the standard, but it seems it's set to use an old version of Meson build which dose not have C18 as an option.

What are my options?

https://github.com/troglobyte-coder/sdl_test

Start by reproducing the SDL2 subproject setup from the linked sdl_test project with the reported Meson and C18 versions. Inspect the subproject's Meson configuration and compare its supported C standards with the consumer project's settings. Done means the compatibility problem and available options are clearly identified, with any required project change covered by an appropriate test or reproduction.

Written by the indexing model from the issue text.