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+# [hmatrix][hmatrix2] installation
+
+This package requires the [Glasgow Haskell Compiler](http://www.haskell.org/ghc/index.html) ghc >= 6.10, and [cabal-install](http://www.haskell.org/haskellwiki/Cabal-Install), conveniently available in the [Haskell Platform](http://hackage.haskell.org/platform), and the development packages for [GSL](http://www.gnu.org/software/gsl) and BLAS/[LAPACK](http://www.netlib.org/lapack). (The graphical functions also require **gnuplot** and **imagemagick**.)
+
+[hmatrix]: http://code.haskell.org/hmatrix
+[hmatrix2]: http://perception.inf.um.es/hmatrix
+
+
+## Linux ##################################################
+
+
+Ubuntu/Debian:
+
+    $ sudo apt-get install libgsl0-dev liblapack-dev
+    $ cabal install hmatrix
+
+Arch Linux: If the automatic installation from Hackage fails, install atlas-lapack and gsl, unpack the source, change the build-type to Simple in hmatrix.cabal (line 28) and add extra-libraries: gsl lapack (line 194). 
+
+Other distributions may require additional libraries. They can be given in a **--configure-option**.
+
+## Mac OS/X ###############################################
+
+
+GSL must be installed via Homebrew or MacPorts.
+
+Via Homebrew:
+
+    $ brew install gsl
+    $ cabal install hmatrix
+
+Via MacPorts:
+
+    $ sudo port install gsl +universal
+    $ cabal install hmatrix
+
+(Contributed by Heinrich Apfelmus, Torsten Kemps-Benedix and Ted Fujimoto).
+
+## Windows ###############################################
+
+We use this [GSL binary](http://www.miscdebris.net/blog/2009/04/20/mingw-345-binaries-of-gnu-scientific-library-112-for-use-with-mingw-and-visual-c/), and blas/lapack dlls built with g77 (contributed by Gilberto Camara). All required files are in [gsl-lapack-windows.zip][winpack].
+
+(Due to [issue 21](https://github.com/albertoruiz/hmatrix/issues/21) we need hmatrix-0.13.1.0.)
+
+1) Install the Haskell Platform (tested on 2011.2.0.1)
+
+    > cabal update
+
+2) Download and unzip the following file into a stable folder %GSL%
+
+    http://perception.inf.um.es/hmatrix/gsl-lapack-windows.zip
+
+3.a) In a msys shell the installation should be fully automatic:
+
+    $ cabal install hmatrix-0.13.1.0 --extra-lib-dir=${GSL} --extra-include-dir=${GSL}
+
+3.b) Alternatively, in a normal windows cmd:
+
+     > cabal unpack hmatrix-0.13.1.0
+
+   Edit hmatrix.cabal, in line 28 change build-type to "Simple", and then
+
+     > cabal install --extra-lib-dir=%GSL% --extra-include-dir=%GSL%
+
+   It may be necessary to put the dlls in the search path.
+
+
+NOTE: The examples using graphics do not yet work in windows.
+
+[install]: http://code.haskell.org/hmatrix/INSTALL
+[install2]: http://patch-tag.com/r/aruiz/hmatrix/snapshot/current/content/pretty/INSTALL
+[winpack2]: http://perception.inf.um.es/hmatrix/gsl-lapack-windows.zip
+[winpack]: https://github.com/downloads/AlbertoRuiz/hmatrix/gsl-lapack-windows.zip
+
+## Tests ###############################################
+
+After installation we must verify that the library works as expected:
+
+    $ cabal install hmatrix-tests --enable-tests
+    $ ghci
+    > Numeric.LinearAlgebra.Tests.runTests 20
+    OK, passed 100 tests. 
+    OK, passed 100 tests.
+    ... etc...
+
+If you get any failure please run lapack's own tests to confirm that your version is not broken. For instance, in ubuntu 9.04, **libatlas-sse2** does not work (see this [bug report](https://bugs.launchpad.net/ubuntu/+source/atlas/+bug/368478)). If your lapack library is ok but hmatrix's tests fail please send a bug report!
+
+
+## Optimized BLAS/LAPACK ##########################################
+
+I have successfully tested ATLAS and MKL on Linux.
+
+### [ATLAS](http://math-atlas.sourceforge.net/)  ####################
+
+In Ubuntu >= 9.04 we need:
+
+    $ sudo apt-get install libatlas-base-dev
+
+In older Ubuntu/Debian versions we needed:
+
+    $ sudo apt-get install refblas3-dev lapack3-dev atlas3-base-dev
+
+We may use a version (sse2, 3dnow, etc.) optimized for the machine.
+
+### Intel's MKL  ###############################################
+
+There is a free noncommercial download available from Intel's website. To use it I have added the following lines in my .bashrc configuration file:
+
+    export LD_LIBRARY_PATH=/path/to/mkl/lib/arch
+    export LIBRARY_PATH=/path/to/mkl/lib/arch
+
+where arch = 32 or em64t.
+
+The library must be installed with the -fmkl flag:
+
+    $ cabal install hmatrix -fmkl
+
+