Adding 'weka'.

pkgs/applications/science/math/weka/default.nix

@@ -0,0 +1,32 @@
+{ stdenv, fetchurl, jre, unzip }:
+
+stdenv.mkDerivation {
+  name = "weka-3.6.9";
+  
+  src = fetchurl {
+    url = "mirror://sourceforge/weka/weka-3-6-9.zip";
+    sha256 = "0rnis4vvihhdcdvpp79hkmklcnn897paa0qrs95cbjnpgvxzbczs";
+  };
+
+  buildInputs = [ unzip ];
+  
+  # The -Xmx1000M comes suggested from their download page:
+  # http://www.cs.waikato.ac.nz/ml/weka/downloading.html
+  installPhase = ''
+    mkdir -pv $out/share/weka $out/bin
+    cp -Rv * $out/share/weka
+    
+    cat > $out/bin/weka << EOF
+    #!${stdenv.shell}
+    ${jre}/bin/java -Xmx1000M -jar $out/share/weka/weka.jar
+    EOF
+    
+    chmod +x $out/bin/weka
+  '';
+  
+  meta = {
+    homepage = "http://www.cs.waikato.ac.nz/ml/weka/";
+    description = "Collection of machine learning algorithms for data mining tasks";
+    license = "GPLv2+";
+  };
+}

pkgs/top-level/all-packages.nix

@@ -9255,6 +9255,8 @@ let
 
   msieve = callPackage ../applications/science/math/msieve { };
 
+  weka = callPackage ../applications/science/math/weka { };
+
   yacas = callPackage ../applications/science/math/yacas { };