All this will hopefully change in future and was
discussed in some
length on the LAD list some time ago. Until that changes I personally
recommend to compile jack without dbus unless you want to use laditools.
I use Gentoo pro audio overlay, I have found if using FFADO i seem to need to
have the dbus USE flag turned on.
Also, I'm new to the whole live ebuilds
thing. I see that the
overlay offers Ardour, Jack, and many other things in the form of
direct CVS snapshots. It seems that these are prefered, however, it
looks like they often require unmasked versions of dependency
programs. Should I be afraid of that? For example, the live ebuild
for Ardour seems to be trying to pull in a version of aubio that is
masked for amd64, though I didn't see a bug in the bug database
explaining why. Should I simply unmask any package that is demanded
of a program in the overlay on the basis that overlay programs are
basically bleeding edge anyway?
I can't help you with that specifically since I never used gentoo but
as a general guideline: stay away from it if you don't know what you're
doing. A CVS (or any version control system for that matter) checkout
might be totally broken and there's no guarantee that it will even
compile.
Live ebuilds are always masked for this very reason. However you may find that
some things are worth unmasking. (I have found that for my hardware I need to use
the live ebuild for FFADO and Jack to get the best results..
You won't find reported bugs on Gentoo for live ebuilds as they aren't really
supported but the bug you find may be worth checking for and reporting upstream
(if you intend to help the particular project)... BTW Ardour 2.x live ebuild is
relatively stable but not 3.x....
I highly recommend you join the pro-audio overlay mailing list for specific
discussion around this overlay... (We won't bite :)