Hello, I am trying to run relax-1.3.10 on ubuntu 10.10. I am using the KDE and root enabled. I unpacked and decompressed the package in /usr/local, created a symbolic link in /usr/local/bin by typing ln -s ../relax-1.3.10/relax . and then ran relax by typing relax -test I got Segmentation fault I also tried going to the base directory relax-1.3.10 and typing scons -install. I get scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... install(["install"], []) #################### # Installing relax # #################### Installing the program relax into the directory '/usr/local/relax' Copying all files in '/usr/local/relax-1.3.10' to '/usr/local/relax'. Creating the symbolic link from '/usr/local/relax/relax' to '/usr/local/bin/relax'. Running relax to create the byte-compiled *.pyc files. Segmentation fault scons: done building targets. I tried compiling from the source code as well. I extracted the relax-1.3.10.src.tar.bz2 package and from the base relax directory typed scons I get scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... ########################### # Compiling the C modules # ########################### Building the relaxation curve fitting module 'maths_fns/relax_fit.so' gcc -o maths_fns/c_chi2.os -c -I/usr/include/python2.6 -I/usr/lib/python2.6/dist-packages/numpy/core/include -fPIC maths_fns/c_chi2.c gcc -o maths_fns/exponential.os -c -I/usr/include/python2.6 -I/usr/lib/python2.6/dist-packages/numpy/core/include -fPIC maths_fns/exponential.c maths_fns/exponential.c:23: fatal error: Python.h: No such file or directory compilation terminated. scons: *** [maths_fns/exponential.os] Error 1 scons: building terminated because of errors. How should I proceed from here ?? Thanks a lot, Shantanu S. Bhattacharyya -- Shantanu S. Bhattacharyya Grad Student, Biological Sciences Carnegie Mellon University url : http://esesbee.com