How to export header when installing my project?

[Siudya]

Repo: https://github.com/Siudya/saifcpp
Branch: main

I try xmake && xmake install -o install_dir
But headers in include are not exported to install_dir/include. What declaration should I add to xmake.lua to export headers?

[star-hengxing]

https://xmake.io/#/manual/project_target?id=targetadd_headerfiles

[Siudya]

Thanks, very helpful