CGAL users discussion list

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hi I am new at CGAL and have some problem with installation.
my step have been:

deb ftp://ftp.mpi-sb.mpg.de/pub/outgoing/CGAL/debian  lenny main contrib
non-free
deb-src ftp://ftp.mpi-sb.mpg.de/pub/outgoing/CGAL/debian lenny main contrib
non-free
and donwload and install with synaptics and also some other gadgets

to which places to I have to install gmp-4.2.4.tar.gz, LEDA-6.2-free-FC8_....,
mpfr... and taucs_full.tgz
to I have to add some paths in my .profile?


in the demo I wrote: cmake .

and it writes: This demo requires CGAL, QGLViewer, OpenGL and QT4, and will 
not
be compiled

In my opinion I diid install all of them and my comp found QGLVIewer and CGAL

later I compiled the demos and when I want to open the executing file I get
this message:

terminate called after throwing an instance of 'CGAL::Assertion_exception'
  what():  CGAL ERROR: assertion violation!
Expr: -CGAL_IA_MUL(-1.1, 10.1) != CGAL_IA_MUL(1.1, 10.1)
File: /usr/include/CGAL/Interval_nt.h
Line: 154
Explanation: Wrong rounding: did you forget the -frounding-math option if you
use GCC?


what did I miss?