I can’t install Ardour2.1 for Mac OS X (i run 10.4.11 on Intel), because it tells me to install X11 before running the app.
I downloaded X11 from apple.com, but X11 installation tells me “You cannot install X11 on this volume. Newer Software already exists on your computer”.
Do not download X11 from the Apple website, it provides an outdated version. Instead, install X11 from your OS X install disk and after update it with software update