The most simple way to get the qt demo program working is

1) In "linux" type ./configure.sh
2) In "generic" type gmake
3) In "qt" type gmake

This will leave you with the executable "qpplotdemo".

If you want ruby support define the environment variable RUBYINCL. It
should point to where ruby.h is. For example on freebsd
  export RUBYINCL=/usr/local/lib/ruby/1.8/i386-freebsd4

For python support define PYTHONINCL, and let it point to where
Python.h is, for example
  export PYTHONINCL=/usr/local/include/python2.2

Note that script support requires SWIG to be installed in order to
generate the wrappers.

The instructions are now 
1) In "linux" type ./configure.sh
2) In "generic" type gmake
3) In "ruby" type ./swigruby.sh
4) In "python": follow the instructions there
5) In "qt" type gmake

To see the script interfaces work try "qpplotdemo -script".
