Hello.

Ardour 4 is out, as you surely  know.

As usual since 6 or 7 years, still no possibilities to make a payment without paypal.
Some of us don't want to use paypal.
So you can't have a «ready to run» binary if you don't pay (fair, it's free as free speech, not free beer) but you can't pay.
And now a new feature for the «you don't pay» users, a demo version that turns silent after 10 minutes (nice feature, really ! Amazing !  so clever to spend time on that, than to add a payment system)

So here is how i build from source on  a Gnu/Debian Wheezy.

Open the tar file.

./waf configure --with-backend=alsa,jack --no-jack-metadata --prefix=/6_years/people/asking/paypal/alternative/so_hard_to_do

Adapt the options for you needs.
You can see the options with :

/waf configure --help |less

Check the errors when you configure, and install the missing packages.
Use your package manager accordingly to your Gnu/Linux distro.
On Gnu/Debian, apt or aptitude.
Add or remove packages if you already have them or not.
The configure should tell you what you need/miss

aptitude -R install libraptor2-dev libsndfile1-dev libgnomecanvas2-dev libsigc++-2.0-dev libcairo2-dev liblrdf0-dev libfreetype6-dev libfftw3-dev libglibmm-2.4-dev libcairomm-1.0-dev libpangomm-1.4-dev libatkmm-1.6-dev libart2.0-cil-dev libgnomecanvasmm-2.6-dev liblo-dev librasqal3-dev libogg-dev libflac-dev libvorbis-dev libsamplerate0-dev libaudio-dev liblv2dynparam1-dev libserd-dev libsord-dev libsratom-dev liblilv-dev libsuil-dev librubberband-dev vamp-plugin-sdk libaubio-dev libjack-dev liblilv-dev

Once the configuration is done without errors :

./waf build -jX

X=thread your cpu can handle. example : ./waf build -j8
Wait a little, it's fast on recent CPU with cores.

Then go to the directory you've declared in the configure --prefix=
For example :
cd 6_years/people/asking/paypal/alternative/so_hard_to_do
You'll find directories :
bin etc lib share

cd bin
./ardour4

Work perfectly on a Gnu/Debian Wheezy.

Best.