Unable to add external library to Qt6

[Menre]

Hello,
I have a project in Qt6 but I can't add external library to the project. When I right-click on the project to add the library, a new pop-up window comes up but the options below are all greyed out.
Add New...
...
Add Library...
Does anyone have an idea about solving this problem, please?
Thanks

[SGaist]

Hi,

Are you working on a cmake project ?

[Menre]

Yes, I am working on a cmake project.

[SGaist]

Then AFAIK, you'll have to do it by hand. Is it a known library that you want to add to your project ?

[Menre]

@SGaist The Eigen Library is a known library and that is what I am trying to add to a project.

[SGaist]

You have a chapter in the Eigen documentation on how to use the library with a cmake project.