Hi,
ATLAS has detected that you are running on an x86 architecture (eg., Athlon, P4, PIII, etc), but do not have a pre-2.96 gcc installed. Using gcc 3/2.96 will result in a performance loss of 10-20% IN THE BEST CASE over a gcc previous to 2.96. If your install goes slightly wrong, performance drops of 50% are more normal with these compilers. Full details of this problem can be found at: http://www.cs.utk.edu/~rwhaley/ATLAS/gcc30.html
If you actually click on the link you can read that "all of these problems appear to be fixed in gcc 3.1". So the message appears to be outdated, and should not apply to gcc 4.0.2. Do not be stopped by a mere warning ! But I am not an atlas expert, just one of many people who is annoyed by the incomplete blas/lapack libraries, so that one cannot invert a matrix in scipy without compiling atlas, which can be a major pain. Of course I have not yet switched to the new scipy, so maybe things are better now. Or packagers have finally decided to ban incomplete blas/lapack libraries and therefore build a better world where the sky is blue and matrices invert. Vincent -- Vincent Favre-Nicolin Université Joseph Fourier http://v.favrenicolin.free.fr ObjCryst & Fox : http://objcryst.sourceforge.net