diff --git a/pkgs/development/compilers/ecj/default.nix b/pkgs/development/compilers/ecj/default.nix
new file mode 100644
index 000000000000..ddf30d7d464d
--- /dev/null
+++ b/pkgs/development/compilers/ecj/default.nix
@@ -0,0 +1,48 @@
+{ fetchurl, stdenv, unzip, ant }:
+
+let
+  version = "3.5";
+  date    = "200906111540";
+in
+  stdenv.mkDerivation rec {
+    name = "ecj-${version}";
+
+    src = fetchurl {
+      url = "http://eclipse.ialto.org/eclipse/downloads/drops/R-${version}-${date}/ecjsrc-${version}.zip";
+      sha256 = "0f5xfi0458w31dr4pkvrjh1f9h2hbn7ssq9gnnma6gznj45jvy7k";
+    };
+
+    buildInputs = [ unzip ant ];
+
+    unpackPhase = ''
+      mkdir "${name}"
+      cd "${name}"
+      unzip "$src"
+    '';
+
+    # Use whatever compiler Ant knows.
+    buildPhase = "ant build";
+
+    installPhase = ''
+      mkdir -pv "$out/lib/java"
+      cp -v *.jar "$out/lib/java"
+    '';
+
+    meta = {
+      description = "The Eclipse Compiler for Java (ECJ)";
+
+      longDescription = ''
+        ECJ is an incremental Java compiler.  Implemented as an Eclipse
+        builder, it is based on technology evolved from VisualAge for Java
+        compiler.  In particular, it allows users to run and debug code which
+        still contains unresolved errors.
+      '';
+
+      homepage = http://www.eclipse.org/jdt/core/index.php;
+
+      # http://www.eclipse.org/legal/epl-v10.html (free software, copyleft)
+      license = "EPLv1.0";
+
+      maintainers = [ stdenv.lib.maintainers.ludo ];
+    };
+  }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 54b26e04bfa6..adc91bdd1d6d 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -654,6 +654,10 @@ let
     inherit fetchurl stdenv cdrkit m4;
   };
 
+  ecj = import ../development/compilers/ecj {
+    inherit fetchurl stdenv unzip ant;
+  };
+
   enblendenfuse = import ../tools/graphics/enblend-enfuse {
     inherit fetchurl stdenv libtiff libpng lcms libxmi boost;
   };