===================
Preparation:  Under Debian:

Presumably you already have:
  apt-get install  g++ make

Required tools and libraries:
  apt-get install  qt4-qmake libqt4-dev libqwt5-qt4-dev
  apt-get install  libasound2-dev libgsl0-dev libatlas-base-dev

Recommended documentation:
  apt-get install  libasound2-doc

=====================
Sanity check:

After installing the required packages, please do
  qmake -v
and make sure it reports version 2.01a or later.

If it reports something earlier, even though you installed the
qt4-make package, this may be because the package "qt3-dev-tools"
provides qmake-qt3, which may be aliased to qmake.  This will cause
problems.  If qt3-dev-tools is installed, the easiest thing may be to
see if it can be removed without too much damage:

        apt-get remove --dry-run qt3-dev-tools

If it looks OK to just remove it, do so.  Alternatively, you /might/
be able to leave it in place and work around it, perhaps by running
qmake-qt4 instead of simply qmake, but if you do that you're on your
own; I've never tried it and I don't know what will happen.

===================
Compilation:

In this directory, simply:
  qmake         # do once
  make          # do each time you need to recompile