Hello everyone, I am new to this so bear with me! I have been trying to build scipy on our Opteron machine (linux enterprise 3, gcc 3.2.3) and had no success, I searched the mailing list and found the link about optimization and gcc version http://www.scipy.net/pipermail/scipy-user/2004-November/003815.html and decided to only build blas and lapack and see if I can get the correct answer for the example that is given in the above link I tried with gcc 3.2.3 and no optimization and had no luck I then build a local copy of gcc 3.4.3 and tried with/without optimization and still have no luck my answers are wr=9.32183,-9.59852e-16,-0.321825,wi=0,0,0 whereas the above link gives wr=9.32183,-6.20979e-16,-0.321825,wi=0,0,0 at this point I am unable to proceed simply because I have no idea what to do, according to the above link gcc 3.4.3 should solve the problem but I am not sure why it does not do it in my case. any help/hints is greatly appreciated. Leila