Building From Source on Linux¶
- On Linux, SciPy and NumPy libraries’ official releases are source-code only. Installing NumPy and SciPy from source is reasonably easy; However, both packages depend on other software, some of them which can be challenging to install, or shipped with incompatibilities by major Linux distributions. Hopefully, you can install NumPy and SciPy without any software outside the necessary tools to build python extensions, as most dependencies are optional.
- Most major Linux distributions now ship NumPy and SciPy and, those binary packages are now reasonably reliable to use. Many other binary options are also available, ranging from individually made packages by some scipy developers for a specific Linux version, to whole commercially-supported scientific distributions. However, keep in mind that if you want to use the last improvements done to NumPy and SciPy on Linux, you have to build it from sources.
To build NumPy/SciPy from source, get the source package, unpack it, and:
python setup.py install --user # installs to your home directory -- requires Python >= 2.6
python setup.py build sudo python setup.py install --prefix=/usr/local # installs to /usr/local
Before building, you will also need to install packages that NumPy and SciPy depend on
- BLAS and LAPACK libraries (optional but strongly recommended for NumPy, required for SciPy): typically ATLAS + LAPACK, or MKL, or ACML
- C and Fortran compilers (typically gcc and gfortran).
- Python header files (typically a package named python-dev or python-devel)
- Unless you are building from released source packages, the Cython compiler is necessary (typically in a package named cython). For building recent SciPy, it is possible that you need Cython in a newer version than is available in your distribution.
Typically, you will want to install all of the above from packages supplied by your Linux distribution, as building them yourself is complicated. If you need to use specific BLAS/LAPACK libraries, you can do
export BLAS=/path/to/libblas.so export LAPACK=/path/to/liblapack.so export ATLAS=/path/to/libatlas.so python setup.py ............
If you don’t want to any LAPACK, just do “export LAPACK=”.
You will find below additional installation instructions and advice for many major Linux distributions.
- Fedora Core 8, openSUSE 10.2, RHEL/Centos 5
- Mandriva 2007.1
- Debian / Ubuntu
- Andrew Straw’s unofficial repository for Ubuntu / Debian
- Building everything from source with gfortran on Ubuntu (Nov 2010)
- Building everything from source with gfortran on Ubuntu (Feb 2008)
- Any distribution with Intel C compiler and MKL
- Any Linux distro: self-contained local installation with Sage.
D.C. has packaged the last released of numpy, scipy as well as lapack and blas dependencies for Fedora Core 8, opensuse 10.2 and Centos/RHEL 5 and a few others thanks to the opensuse build service. I strongly advise you to use those packages instead of the “official” ones, which are often unusable. The repository is there:
To use this repository with yum, simply pick up your arch/distribution from http://download.opensuse.org/repositories/science:/ScientificLinux/ , and take the corresponding .repo file. Put this .repo file into /etc/yum.repo.d/, and then install numpy/scipy with yum:
yum install python-numpy python-scipy
I also packaged timers and testers for blas and lapack, which can be useful if you intend to compile special optimized versions of BLAS/LAPACK (eg GOTO or ATLAS). You can also find the package lapack3-pic, which can be used to build a complete LAPACK with ATLAS: it is a static version, but as it is built with the -fPIC compiler flag, it can be used to build python extensions; this is particularly useful for x86_64 arch.
ATLAS is a BLAS/LAPACK implementation which tuned itself on the machine to provide ideal performances, and often match vendor specific implementations. Unfortunately, building ATLAS is not easy. But, it is getting easier all the time.
These instructions show how to build ATLAS (and LAPACK) from their official distributions.
First, download and unpackage the LAPACK distribution from netlib (you need these to build a complete version of LAPACK).
wget http://www.netlib.org/lapack/lapack-3.1.1.tgz tar zxvf lapack-3.1.1.tgz cd lapack-3.1.1
There are several make.inc files in the INSTALL directory of the lapack distribution. Copy one of those files to the main directory. For example:
cp INSTALL/make.inc.gfortran make.inc
Now, you must edit the make.inc file to ensure that the OPTS and NOOPT lines both contain the flag for compiling position-independent code on your platform (e.g. with gcc/gfortran it is -fPIC). For example:
OPTS = -O2 -fPIC NOOPT = -O0 -fPIC
(Note: Make sure that if you build with gfortran that g77 is not installed on your system (or at least is not in your PATH when numpy is being built) as you need to link with the same compiler that you built lapack with when numpy builds. It will try and find g77 first which will lead to linking errors if you have built lapack with gfortran). Then change to the SRC directory and run make
cd SRC make
This will create an lapack_<XXXX>.a file in the head lapack directory. You will need the location of this file to configure atlas.
Now, download the latest release of ATLAS (these instructions worked on 3.7.37). See, for example, http://sourceforge.net/project/showfiles.php?group_id=23725. Unpackage the result, change to the directory created, and create a directory to contain the resulting build. This directory should be named appropriate for the platform (you can build for multiple platforms from the same SOURCE tree — perhaps the source is on a network drive and builds are taking place for multiple platforms).
tar jxvf atlas3.7.37.tar.bz2 cd ATLAS mkdir ATLAS_<my_platform_type>
cd ATLAS_<my_platform_type> ../configure -Fa alg -fPIC --with-netlib-lapack=/path/to/lapack/lapack_<XXXX>.a make
Your atlas libraries should now be in the lib subdirectory of the current directory. You should copy them to some-place that you can tell site.cfg about so that numpy and scipy can pick them up. If you want to create shared libraries, then you can do that by
cd lib make shared # for sequential libraries make ptshared # for threaded libraries
after changing to the lib directory where the .a files are already located.
ashigabou repository does not provide binary versions, but provides all the tools to make the building process of ATLAS almost painless: it will build a complete LAPACK, build it with the right fortran compiler to avoid ABI issues (eg _gfortran_string_write, etc...), and with the right compiler flags such as it is usable to build numpy and scipy (with the -fPIC option).
First, download the source rpm included in the ashigabou repository (the file atlas-version.src.rpm), and install from the ashigabou repository the package lapack3-pic (the rpm will refuse to build without it). Then, use the following:
rpm -ivh atlas-version.src.rpm
This will NOT install atlas, just uncompress all the necessary files for building the rpm in /usr/src/packages. Before building atlas, you must disable dynamic change of CPU frequency (used to decrease battery consumption):
cpufreq-selector -g performance
If this fails telling you no cpufreq support, this is fine. Now, to build the rpm, go into the directory /usr/src/packages/SPEC, and execute
rpmbuild -ba atlas.spec
This will build the rpm: this can take a long time, even on a powerful machine. What matters is whether atlas has arch defaults for your machine: if not, it can take several hours (it takes 2 hours and a half on a P4 @3.2 Ghz, but takes ~10 minutes on my macbook under linux). If successfull, you will get an installable rpm in /usr/src/packages/RPMS/ARCH (where ARCH can be x86_64 or i586 or something else depending on the distribution and your arch).
The rpm contains two (shared) libraries: libblas.so and liblapack.so, installed in /usr/lib/atlas/sse2. They are meant to be drop-out for the standard BLAS and LAPACK (the ones in refblas3 and lapack3). To use the atlas libraries, once you installed numpy and scipy, you should tell the OS to use atlas instead of default libraries by using LD_LIBRARY_PATH. That is, normally, you can use numpy by :
python -c "import numpy as N; a=N.random.randn(1000, 1000); N.dot(a, a)"
To use atlas, you do:
LD_LIBRARY_PATH=/usr/lib/atlas/sse2 python -c "import numpy as N; a=N.random.randn(1000, 1000); N.dot(a, a)"
If everything is working correctly, you will see that the above script runs much faster with atlas than without (I see a ten fold speed increase on my machine).
Binary packages for NumPy 126.96.36.199 and SciPy 0.5.2.1 are available via the contrib urpmi repository:
Debian and Ubuntu ship with NumPy and SciPy – to install their binary packages, use
sudo apt-get install python-numpy python-scipy
Note (esp. Ubuntu versions prior to Maverick): Do not install versions 3.6.0-* of libatlas-sse2 or libatlas-sse packages – they contained severe known bugs.
Andrew Straw has an unofficial repository for NumPy .deb packages. These were built with stdeb. The binaries are for Ubuntu Dapper (6.06 LTS).
To use the binary package in Ubuntu Dapper, add the following line to your /etc/apt/sources.list:
deb http://debs.astraw.com/ dapper/
sudo apt-get install python-numpy
You can verify ATLAS support by running the command ldd /usr/lib/python2.4/site-packages/numpy/linalg/lapack_lite.so, which should result in output like the following:
liblapack.so.3 => /usr/lib/atlas/liblapack.so.3 (0x00002aaaaabcf000) libblas.so.3 => /usr/lib/atlas/libblas.so.3 (0x00002aaaab435000) libg2c.so.0 => /usr/lib/libg2c.so.0 (0x00002aaaabd15000) libm.so.6 => /lib/libm.so.6 (0x00002aaaabe44000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00002aaaabfca000) libc.so.6 => /lib/libc.so.6 (0x00002aaaac0d7000) /lib64/ld-linux-x86-64.so.2 (0x0000555555554000)
The following may (or may not) work on any Debian-based distribution:
Add the following line to your /etc/apt/sources.list:
deb-src http://debs.astraw.com/ dapper/
To download and build, type:
sudo apt-get build-dep python-numpy sudo apt-get -b source python-numpy
When you start using this repository, you might get warning messages like this:
The following signatures couldn't be verified because the public key is not available.
Or you will be asked questions like this over and over:
WARNING: The following packages cannot be authenticated! ... Install these packages without verification [y/N]?
Install the package astraw-keyring to eliminate these messages. This installs Andrew’s archive signing key to your apt through the apt-key add command.
If you install NumPy or SciPy ontop of a debian sarge installation for a CPU with SSE2, there is a bug in libc6 2.3.2 affecting floating point operations (fixed in version 2.3.3). Due to this bug, the numpy and scipy tests crach with a SIGFPE. Since there is now patch available, in order to fix this the libc6 sources need to be downloaded, fixed, and rebuilt. See Andrew Straw’s instructions for more information.
If you choose not to use Andrew Straw’s repository (which includes numpy built with ATLAS support), here are some further notes to build numpy and scipy from sources on your computer.
First, you need to install several libraries/tools (you need to enable universe repository for some of those packages):
sudo apt-get install gcc g77 python-dev atlas3-base-dev
To use optimized lapack and blas, you should also install the atlas corresponding to your achitecture: atlas3-sse2-dev if you have a CPU with SSE2 capabilities, atlas3-sse-dev if you have a CPU with SSE capabilities only, etc... If you have a recent x86 (eg intel or AMD cpu), it should support SSE2. To check whether your CPU supports sse, sse2, etc.. you can check using the following command:
cat /proc/cpuinfo | grep flags
and check whether sse, sse2, etc... appear on it.
Then, you can build numpy with the following, inside the numpy source directory:
python setup.py build
Then, to install it system-wide (requires root privileges):
python setup.py install
To install it in another directory, you need to use the prefix option. For example, I like to install local softwares in my $HOME/local, so I do the following:
python setup.py install --prefix=$HOME/local
Note that if you do not install numpy system wide, you need to tell python to look for the directory where you installed numpy. For example, if you use $HOME/local as the former example, then you should add $HOME/local/lib/python2.4/site-packages in your PYTHONPATH:
(change python2.4 to python2.5 if you are using python2.5, obviously).
(This section reflects the situation of July 2009. If you have newer of more accurate information, feel free to modify this section.)
OpenSUSE does not contain NumPy, SciPy or Matplotlib in the standard installation. Instead those packages are provided by additional repositories, that seem to be run by volunteers. However Novell provides webspace for some of those repositories. Packages usually exist only for a few current SUSE versions.
The following repositories are currently the best to obtain NumPy, SciPy and Matplotlib. They can be added to the package manager (YaST) with the Installation Source dialog. The packages will then appear in the Software Management dialog.
Alternatively the *.rpm files can be downloaded and installed manually (for example ‘rpm -U <filename>’ or with ‘kpackage’).
- Science: [http://download.opensuse.org/repositories/science/]
- This repository contains: NumPy, SciPy, Matplotlib, and many more packages of interest for scientific users.
- Installation was tested with openSUSE 11.0 and 11.1, both i586 and x86-64.
- Education: [http://www.opensuse-education.org/download/repo/1.0/] This project seems to have some backing from Novell. It is primarily oriented towards schools. The repository was added despite of the broken packages, because it is big and still active. Also its relatively wide audience (schools) might lead to continuing development. (The author of this section has also filed bug reports in their Bugzilla.)
- This repository contains: NumPy, SciPy, Matplotlib, and very many other packages.
- Repository has own Bugzilla: and Website <http://en.opensuse.org/Education
- Tested with openSUSE 11.0 and 11.1, x86-64:
- openSUSE 11.0: broken package SciPy
- openSUSE 11.1: one error in scipy.test(), package seems (mostly) functional though.
Alternatively one can search for packages in repositories hosted by Novell here: One can also search for packages in the very big Packman repository: <http://packman.links2linux.org/.
- Lists of Packman mirrors: 1 2
- The packman repository should be given a low priority (high value, for example 200, in priority field). It contains very many packages, that are also present in SUSE’s standard repositories. These packages might otherwise override original packages from SUSE.
Users of older versions of SUSE/openSuse can install Sage, a big collection of Mathematics related software. It was recently (Jul. 2009) reported that compiling and installing Sage from sources worked flawlessly, on SUSE Linux 10.2:
- A more detailed description how to install Sage from sources is on this page too.
ATLAS is a replacement for BLAS and parts of LAPACK, that is much faster. It must be built from sources, because it optimizes itself for the computer’s processor. The build process will run for ten minutes to several hours.
There is currently no comfortable way to use ATLAS on openSuse.
The build instructions for ATLAS on this page work, but unfortunately the NumPy and SciPy packages don’t work with ATLAS. One could build NumPy and SciPy from sources though, and a relatively painless way to do this is the Sage package. (If you know a comfortable way to make ATLAS work on openSuse, please put it here into the Wiki.)
David Cournapeau has a repository devoted to ATLAS, but he has not added packages for recent SUSE versions.
This repository contains: ATLAS and additionally other scientific software.
SUSE (and Red Hat) regularly shipped versions of the BLAS library where some functions were missing. This bug has finally been fixed in March 2007. This means SUSE 10.2 and prior come with a broken BLAS, in later versions SUSE’s original BLAS should work. Unfortunately the repositories mentioned here do no longer contain corrected/complete packages of BLAS and LAPACK for the affected versions (SUSE 10.2 and older).
The bug’s cause was as follows: The BLAS rpm is created from Netlib’s LAPACK package and not from the BLAS package. Until March 2007 however the LAPACK library did only contain a subset of the functions that were in BLAS. Finally someone begged the LAPACK developers to include the whole BLAS library in the LAPACK package, and they did.
For details see: [https://bugzilla.novell.com/show_bug.cgi?id=228824] and [http://www.netlib.org/lapack/lapack-3.1.1.changes]
These are instructions for building everything from source on a 64 bit Ubuntu system (Maverick: 10.10) on a multicore processor using the latest versions as of November 2010. Everything is installed in a user directory structure in $HOME/local (/home/sam/local in my case). Administrator priviliges are required only in the beginning to disable CPU throttling while building ATLAS.
sudo apt-get install build-essential python-dev swig gfortran python-nose
ATLAS’ timing algorithm require CPU throttling to be disabled. This disables it on the 0th core:
sudo cpufreq-selector -g performance
Then disable it on each additional core. For a quad core processor, these commands will be required:
sudo cp /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor sudo cp /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor sudo cp /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor
Download lapack.tgz from netlib.org and atlas3.9.32.tar.bz2. Extract the atlas archive into a directory named ATLAS and from within it, issue these commands:
mkdir BUILD cd BUILD ../configure -b 64 -Fa alg -fPIC --with-netlib-lapack-tarfile=<path to lapack.tgz> --prefix=/home/sam/local make cd lib make shared make ptshared cd .. make install
Note that make ptshared might not work on a single core machine. Note also that the first “make” command above will take several hours to run, as ATLAS optimizes various performance parameters.
NOTE: Dowloading and building the entire SuiteSparse all at once is easier than the following steps. SuiteSparse Version 4.0.2 is confirmed to have worked on Xubuntu 12.10 with the latest ATLAS, LAPACK, NumPy and SciPy as of 2012-10-18.
Dowload all four packages and extract them in the same directory. Edit UFconfig/UFconfig.mk to read:
CC = gcc CFLAGS = -O3 -fexceptions -m64 -fPIC F77 = gfortran F77FLAGS = -O -m64 -fPIC INSTALL_LIB = /home/sam/local/lib INSTALL_INCLUDE = /home/sam/local/include METIS_PATH = METIS = CHOLMOD_CONFIG = -DNPARTITION
Then issue the following commands
cd UMFPACK make library make install cd ../AMD make install cd ../UFconfig cp UFconfig.h /home/sam/local/include
Untar the archive, copy site.cfg.example to site.cfg and edit it:
[[DEFAULT]] library_dirs = /home/sam/local/lib include_dirs = /home/sam/local/include
In the same file, uncomment these lines:
[blas_opt] libraries = ptf77blas, ptcblas, atlas [lapack_opt] libraries = lapack, ptf77blas, ptcblas, atlas [amd] amd_libs = amd [umfpack] umfpack_libs = umfpack
For a single core machine, uncomment these lines:
[blas_opt] libraries = f77blas, cblas, atlas [lapack_opt] libraries = lapack, f77blas, cblas, atlas
Then use the standard installation technique
python setup.py build python setup.py install --prefix=/home/sam/local
This is how I built everything from source on a 64 bit Ubuntu system with latest versions as of February 2008. It took me some time to work out the issues so I thought I’d put the details here. I believe it should work the same on 32 bit systems (leaving out 64 bit related options).
sudo apt-get install build-essential python-dev swig gfortran
Install nose (easy_install nose). Do not install python-nose, it is an earlier version that doesn’t work with scipy. Also make sure g77 is not installed. Distutils will not use gfortran if g77 is installed.
sudo apt-get remove python-nose sudo apt-get remove g77 sudo apt-get install python-setuptools sudo easy_install nose
As described above, copy make.inc.gfortran, add -fPIC flags (and -m64 if building 64 bit) to OPTS and NOOPT. Run make in SRC directory.
As described above untar, create a directory for your build in ATLAS and run configure (add option ‘-b 64’ for 64 bit).
sudo cpufreq-selector -g performance ../configure -b 64 -Fa alg -fPIC --with-netlib-lapack=/path/to/lapack/lapack_<XXXX>.a make
Copy the libraries to a lib directory (/usr/local/lib or ~/scipy_build/lib for example). I found it’s easier to copy all needed libraries and files to a common directory.
Get the latest versions of AMD, UFconfig and UMFPACK and untar them into a directory.
UFconfig/UFconfig.mk should contain:
CC = gcc CFLAGS = -O3 -fexceptions -m64 -fPIC F77 = gfortran F77FLAGS = -O -m64 -fPIC BLAS = -L/usr/lib/gcc/x86_64-linux-gnu/4.2.1 -L/home/robince/scipy_build/lib -llapack -lf77blas -lcblas -latlas -lgfortran LAPACK = -L/usr/lib/gcc/x86_64-linux-gnu/4.2.1 -L/home/robince/scipy_build/lib -llapack -lf77blas -lcblas -latlas -lgfortran
On a 32 bit system, remove the -m64 flags and change the first -L option to -L/usr/lib/gcc/i486-linux-gnu/4.2.1.
Run ‘make’ in UMFPACK directory. Copy resulting libraries and include files.
cp AMD/Lib/libamd.a ~/scipy_build/lib cp UMFPACK/Lib/libumfpack.a ~/scipy_build/lib cp AMD/Include/amd.h ~/scipy_build/lib/include cp UFconfig/UFconfig.h ~/scipy_build/lib/include cp UMFPACK/Include/*.h ~/scipy_build/lib/include
Copy libgfortran into scipy library directory (doesn’t seem to work if it doesn’t find the umfpack_libs together).
cp /usr/lib/gcc/x86_64-linux-gnu/4.2/libgfortran.* ~/scipy_build/lib/
Because of license, configuration, and maintenance issues support for FFTW was removed in versions of SciPy >= 0.7 and NumPy >= 1.2. Instead now uses a built-in version of fftpack.
There are a couple ways to take advantage of the speed of FFTW if necessary for your analysis.
- Downgrade to a NumPy/SciPy version that includes support.
- Install or create your own wrapper of FFTW. See http://developer.berlios.de/projects/pyfftw/ as an un-endorsed example.
After untarring, run configure. I ran configure first and extracted the suggested FLAGS from the Makefile, then added -fPIC and -m64. (Not sure if this is necessary)
./configure --enable-sse2 --enable-threads --with-combined-threads CFLAGS="-O3 -fomit-frame-pointer -fstrict-aliasing -ffast-math -pthread -fPIC -m64" FFLAGS="-g -O2 -fPIC -m64" CXXFLAGS="-g -O2 -fPIC -m64" make sudo make install
Set the following entries in site.cfg (this will also work with fftw if it has been compiled and installed in the default location (/usr/local):
[[DEFAULT]] library_dirs = /usr/local/lib:/home/robince/scipy_build/lib include_dirs = /usr/local/include:/home/robince/scipy_build/lib/include [atlas] atlas_libs = lapack, f77blas, cblas, atlas [amd] amd_libs = amd [umfpack] umfpack_libs = umfpack, gfortran [fftw] libraries = fftw3
Build NumPy and SciPy.
python setup.py build sudo python setup.py install
Add the following lines to site.cfg in your top level NumPy directory to use Intel® MKL for Intel® 64 (or earlier known as em64t) architecture, considering the default installation path of Intel® MKL which is bundled with Intel® Composer XE SP1 version on Linux:
[mkl] library_dirs = /opt/intel/composer_xe_2013/mkl/lib/intel64 include_dirs = /opt/intel/composer_xe_2013/mkl/include mkl_libs = mkl_intel_lp64,mkl_intel_thread,mkl_core
If you are building NumPy for 32 bit, please add as the following
[mkl] library_dirs = /opt/intel/composer_xe_2013/mkl/lib/ia32 include_dirs = /opt/intel/composer_xe_2013/mkl/include mkl_libs = mkl_intel,mkl_intel_thread,mkl_core
Instead of the layered linking approach for the Intel® MKL as shown above, you may also use the dynamic interface lib mkl_rt.lib. So, for both the ia32 and intel64 architecture make the change as below
mkl_libs = mkl_rt
Modify cc_exe in numpy/numpy/distutils/intelccompiler.py to be something like:
cc_exe = 'icc -O2 -g -openmp -avx'
Here we use, default optimizations (-O2), OpenMP threading (-openmp) and Intel® AVX optimizations for Intel® Xeon E5 or E3 Series which are based on Intel® SandyBridge Architecture (-avx). Run icc –help for more information on processor-specific options.
Compile and install NumPy with the Intel compiler (on 64-bit platforms replace “intel” with “intelem”):
python setup.py config --compiler=intel build_clib --compiler=intel build_ext --compiler=intel install
Compile and install SciPy with the Intel compilers (on 64-bit platforms replace “intel” with “intelem”):
python setup.py config --compiler=intel --fcompiler=intel build_clib --compiler=intel --fcompiler=intel build_ext --compiler=intel --fcompiler=intel install
You’ll have to set LD_LIBRARY_PATH to Intel® MKL libraries (exact values will depend on your architecture, compiler and library versions) and OpenMP library for NumPy to work. If you build NumPy for Intel® 64 platforms:
$export LD_LIBRARY_PATH=/opt/intel/composer_xe_2013/mkl/lib/intel64: /opt/intel/composer_xe_2013/compiler/lib/intel64:$LD_LIBRARY_PATH
If you build NumPy for ia32 bit platforms:
$export LD_LIBRARY_PATH=/opt/intel/composer_xe_2013/mkl/lib/ia32: /opt/intel/composer_xe_2013/compiler/lib/ia32:$LD_LIBRARY_PATH
The above instructions must be slightly modified to install NumPy 1.6 with Intel MKL 10.0 on a 64-bit Red Hat 4 system. If threading is desired, set
mkl_libs = mkl_intel_lp64, mkl_intel_thread, mkl_core, guide
Ensure that the -openmp compile flag is passed to the Intel Fortran Compiler (NOT the C compiler).
If threading is not desired, set
mkl_libs = mkl_intel_lp64, mkl_core.
It is possible that LD_LIBRARY_PATH causes a problem, if you have installed MKL and Composer XE in other directories than the standard ones. The only solution I’ve found that always works is to build Python, NumPy and SciPy inside an environment where you’ve set the LD_RUN_PATH variable, e.g:
Configure Python with --prefix=$HOME/opt, make, make install, add $HOME/opt/bin to the front of your PATH and then build NumPy and SciPy with the site.cfg as above in their top level directories (check the config step’s output carefully to make sure it selects MKL). Built like this, you shouldn’t have to set any LD_LIBRARY_PATH for NumPy and SciPy to work. Run the test suites to verify this.
All you need is some basic tools like gcc (no fortran).
Follow the instructions here to build sage from source:
All you have to do is unpack the tar and type make. This takes about 3 hours.
This will install sage in its own directory. python (and ipython) can be found in SAGEROOT/local/bin
If you don’t want to have to type in absolute paths, you can set the environment variables to point to your sage executables. To do this, run sage with the -sh option. My .profile contains the line