I did not find it with a search prompt of "Meson dependency isystem". That said, searching for "isystem" on the meson documentation does yield only 3 results. O

I did not find it with a search prompt of "Meson dependency isystem". That said, searching for "isystem" on the meson documentation does yield only 3 results. One of them is including the include_type field. I don't know if the explanation given there is sufficient to know what to do (if you don't know you're looking at the solution, that is). I found a link to a github issue that settles the matter rather quickly further down the list, but I don't consider having to resort to issues or bug-reports to find a solution a good solution.