How to get Danish letters on US (physical) keyboard on Fedora Linux?

I am a Dane residing in the USA. On Windows, I select "US International Keyboard", and I can produce

æ, ø, å

with

-Gr+z, Alt-Gr+l, Alt-Gr+w

. How can I do the same on Fedora Linux? Is there a keyboard layout file that matches the Windows one? And how do I select it - In the GUI? - In a GNOME and/or XFCE configuration file?