diff --git a/pkgs/development/libraries/eigen/default.nix b/pkgs/development/libraries/eigen/default.nix
new file mode 100644
index 000000000000..bd705fac9835
--- /dev/null
+++ b/pkgs/development/libraries/eigen/default.nix
@@ -0,0 +1,49 @@
+x@{builderDefsPackage
+  , cmake
+  , ...}:
+builderDefsPackage
+(a :  
+let 
+  helperArgNames = ["stdenv" "fetchurl" "builderDefsPackage"] ++ 
+    [];
+
+  buildInputs = map (n: builtins.getAttr n x)
+    (builtins.attrNames (builtins.removeAttrs x helperArgNames));
+  sourceInfo = rec {
+    baseName="eigen";
+    version="2.0.15";
+    name="${baseName}-${version}";
+    ext="tar.bz2";
+    project="${baseName}";
+    url="http://bitbucket.org/${project}/${baseName}/get/${version}.${ext}";
+    hash="c68509b80ec2570d025a98e6c4279062b801593c5165ba3d683852e7dbff1569";
+  };
+in
+rec {
+  src = a.fetchurl {
+    url = sourceInfo.url;
+    sha256 = sourceInfo.hash;
+    name="${sourceInfo.name}.${sourceInfo.ext}";
+  };
+
+  inherit (sourceInfo) name version;
+  inherit buildInputs;
+
+  phaseNames = ["doCmake" "doMakeInstall"];
+      
+  meta = {
+    description = "A C++ linear algebra template header";
+    maintainers = with a.lib.maintainers;
+    [
+      raskin
+    ];
+    platforms = with a.lib.platforms;
+      linux;
+    license = a.lib.licenses.lgpl3Plus;
+  };
+  passthru = {
+    updateInfo = {
+      downloadPage = "http://eigen.tuxfamily.org/index.php?title=Main_Page";
+    };
+  };
+}) x
diff --git a/pkgs/games/soi/default.nix b/pkgs/games/soi/default.nix
new file mode 100644
index 000000000000..811d8d432ceb
--- /dev/null
+++ b/pkgs/games/soi/default.nix
@@ -0,0 +1,55 @@
+x@{builderDefsPackage
+  , mesa, SDL, cmake, eigen
+  , ...}:
+builderDefsPackage
+(a :  
+let 
+  helperArgNames = ["stdenv" "fetchurl" "builderDefsPackage"] ++ 
+    [];
+
+  buildInputs = map (n: builtins.getAttr n x)
+    (builtins.attrNames (builtins.removeAttrs x helperArgNames));
+  sourceInfo = rec {
+    baseName="soi";
+    fileName="Spheres%20of%20Influence";
+    majorVersion="0.1";
+    minorVersion="1";
+    version="${majorVersion}.${minorVersion}";
+    name="${baseName}-${version}";
+    project="${baseName}";
+    url="mirror://sourceforge/project/${project}/${baseName}-${majorVersion}/${fileName}-${version}-Source.tar.gz";
+    hash="dfc59319d2962033709bb751c71728417888addc6c32cbec3da9679087732a81";
+  };
+in
+rec {
+  src = a.fetchurl {
+    url = sourceInfo.url;
+    sha256 = sourceInfo.hash;
+    name = "${sourceInfo.name}.tar.gz";
+  };
+
+  inherit (sourceInfo) name version;
+  inherit buildInputs;
+
+  phaseNames = ["setVars" "doCmake" "doMakeInstall"];
+
+  setVars = a.noDepEntry ''
+    export EIGENDIR=${a.eigen}/include/eigen2
+  ''; 
+      
+  meta = {
+    description = "A physics-based puzzle game";
+    maintainers = with a.lib.maintainers;
+    [
+      raskin
+    ];
+    platforms = with a.lib.platforms;
+      linux;
+    license = "free-noncopyleft";
+  };
+  passthru = {
+    updateInfo = {
+      downloadPage = "http://sourceforge.net/projects/soi/files/";
+    };
+  };
+}) x
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 67fda049989f..45946c9dd1b0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2907,6 +2907,8 @@ let
     stdenv = overrideGCC stdenv gcc45;
   };
 
+  eigen = callPackage ../development/libraries/eigen {};
+
   enchant = callPackage ../development/libraries/enchant {
     inherit (gnome) glib;
   };
@@ -7009,6 +7011,8 @@ let
     inherit (kde3) arts kdelibs;
   };
 
+  soi = callPackage ../games/soi {};
+
   # You still can override by passing more arguments.
   spaceOrbit = callPackage ../games/orbit {
     inherit (gnome) esound;  };