Hi there, Yesterday I asked about building Scipy (http://article.gmane.org/gmane.comp.python.scientific.devel/11832) as I was following the various instructions * here: http://www.scipy.org/Installing_SciPy/BuildingGeneral * and here: http://www.scipy.org/Installing_SciPy/Linux Since then I discovered the SCons script, so first question: is using the SCons script the preferred way to build SciPy now? If so, I think those website should be updated. If not, please help with the next question. Using the setupscons.py script (after cloning and installing numscons from github, version 0.11.0), I encounter the error, "no lapack found, necessary for lapack module" when running "python setupscons.py build". More details in the traceback below. For reference: * Ubuntu 9.04 (Jaunty) * SciPy revision 5951 * other details about my platform: http://pastebin.com/m26f8d1d1 * and I followed the LAPACK instructions at the bottom of this page http://www.scipy.org/Installing_SciPy/BuildingGeneral (i.e. I built LAPACK from source, and I set the environment variable) Any additional pointers to solve this ? I thought ATLAS is used instead of LAPACK; can someone help me understand this? Thanks, Kevin Executing scons command (pkg is scipy.lib.lapack): /usr/bin/python "/usr/local/lib/python2.6/dist-packages/numscons/scons-local/scons.py" -f scipy/lib/lapack/SConstruct -I. scons_tool_path="" src_dir="scipy/lib/lapack" pkg_name="scipy.lib.lapack" log_level=50 distutils_libdir="../../../../../build/lib.linux-i686-2.6" distutils_clibdir="../../../../../build/temp.linux-i686-2.6" distutils_install_prefix="/usr/local/lib/python2.6/dist-packages/scipy/lib/lapack" cc_opt=gcc cc_opt_path="/usr/bin" debug=0 f77_opt=gfortran f77_opt_path="/usr/bin" cxx_opt=g++ cxx_opt_path="/usr/bin" include_bootstrap=/usr/local/lib/python2.6/dist-packages/numpy/core/include bypass=0 import_env=0 silent=0 bootstrapping=0 scons: Reading SConscript files ... Checking if gfortran needs dummy main - MAIN__. Checking gfortran name mangling - '_', '', lower-case. Checking for ATLAS ... yes Checking for F77 LAPACK ... no RuntimeError: no lapack found, necessary for lapack module: File "/home/connectmv/workspace/scipy/scipy/lib/lapack/SConstruct", line 2: GetInitEnvironment(ARGUMENTS).DistutilsSConscript('SConscript') File "/usr/local/lib/python2.6/dist-packages/numscons/core/numpyenv.py", line 133: build_dir = '$build_dir', src_dir = '$src_dir') File "/usr/local/lib/python2.6/dist-packages/numscons/scons-local/scons-local-1.2.0/SCons/Script/SConscript.py", line 553: return apply(_SConscript, [self.fs,] + files, subst_kw) File "/usr/local/lib/python2.6/dist-packages/numscons/scons-local/scons-local-1.2.0/SCons/Script/SConscript.py", line 262: exec _file_ in call_stack[-1].globals File "/home/connectmv/workspace/scipy/build/scons/scipy/lib/lapack/SConscript", line 37: raise RuntimeError("no lapack found, necessary for lapack module") error: Error while executing scons command. See above for more information. If you think it is a problem in numscons, you can also try executing the scons command with --log-level option for more detailed output of what numscons is doing, for example --log-level=0; the lowest the level is, the more detailed the output it.