Compiling ardour is not for the fainthearted. The dependency list is extensive and it took a while on the Pi3 but nothing seemed out of the ordinary for a project of this complexity.
If you are really interested, see http://ardour.org/current_dependencies.html for the dependencies and http://ardour.org/building_linux.html for the procedure.
I had to build a few of the dependencies:
- atkmm-2.22.7
- libart_lgpl-2.3.21
- liblrdf-0.5.0
- pangomm-2.28.4
Time to try some plugins and see if the whole system can handle signal processing.
Thanks to all the Ardour and Linux Audio developers who have made this possible!