diff --git a/pkgs/development/libraries/java/classpath/default.nix b/pkgs/development/libraries/java/classpath/default.nix
new file mode 100644
index 00000000000..f3231ab4ee7
--- /dev/null
+++ b/pkgs/development/libraries/java/classpath/default.nix
@@ -0,0 +1,59 @@
+{ fetchurl, stdenv, javac, jvm, antlr, pkgconfig, gtk, gconf }:
+
+stdenv.mkDerivation rec {
+  name = "classpath-0.98";
+
+  src = fetchurl {
+    url = "mirror://gnu/classpath/${name}.tar.gz";
+    sha256 = "0gxcdysw36vk3dpylg6f44c0fc8g10ayyb521l8bcygz9p6ml6sh";
+  };
+
+  patches = [ ./missing-casts.patch ];
+
+  buildInputs = [ javac jvm antlr pkgconfig gtk gconf ];
+
+  configurePhase = ''
+    # GCJ tries to compile all of Classpath during the `configure' run when
+    # trying to build in the source tree (see
+    # http://www.mail-archive.com/classpath@gnu.org/msg15079.html), thus we
+    # build out-of-tree.
+    mkdir ../build
+    cd ../build
+    echo "building in \`$PWD'"
+
+    ../${name}/configure --prefix="$out"                        \
+         --enable-fast-install --disable-dependency-tracking    \
+         ${configureFlags}
+  '';
+
+  /* Plug-in support requires Xulrunner and all that.  Maybe someday,
+     optionally.
+
+    Compilation with `-Werror' is disabled because of this:
+
+      native/jni/native-lib/cpnet.c: In function 'cpnet_addMembership':
+      native/jni/native-lib/cpnet.c:583: error: dereferencing type-punned pointer will break strict-aliasing rules
+      native/jni/native-lib/cpnet.c: In function 'cpnet_dropMembership':
+      native/jni/native-lib/cpnet.c:598: error: dereferencing type-punned pointer will break strict-aliasing rules
+
+   */
+
+  configureFlags = "--disable-Werror --disable-plugin --with-antlr-jar=${antlr}/lib/antlr.jar";
+
+  meta = {
+    description = "GNU Classpath, essential libraries for Java";
+
+    longDescription = ''
+      GNU Classpath, Essential Libraries for Java, is a GNU project to create
+      free core class libraries for use with virtual machines and compilers
+      for the Java programming language.
+    '';
+
+    homepage = http://www.gnu.org/software/classpath/;
+
+    # The exception makes it similar to LGPLv2+ AFAICS.
+    license = "GPLv2+ + exception";
+
+    maintainers = [ stdenv.lib.maintainers.ludo ];
+  };
+}
diff --git a/pkgs/development/libraries/java/classpath/missing-casts.patch b/pkgs/development/libraries/java/classpath/missing-casts.patch
new file mode 100644
index 00000000000..863ca2cac8c
--- /dev/null
+++ b/pkgs/development/libraries/java/classpath/missing-casts.patch
@@ -0,0 +1,80 @@
+Add missing casts.  The GCC folks applied a similar patch in
+GCC's own copy of Classpath:
+http://gcc.gnu.org/ml/java/2007-05/msg00039.html .
+
+--- classpath-0.98/javax/management/NotificationBroadcasterSupport.java	2009-07-30 16:52:08.000000000 +0200
++++ classpath-0.98/javax/management/NotificationBroadcasterSupport.java	2009-07-30 16:51:58.000000000 +0200
+@@ -218,7 +218,7 @@
+   {
+     if (info == null || info.length == 0)
+       return new MBeanNotificationInfo[0];
+-    return info.clone();
++    return (MBeanNotificationInfo[]) info.clone();
+   }
+ 
+   /**
+
+--- classpath-0.98/java/util/concurrent/CopyOnWriteArrayList.java	2008-03-27 18:39:25.000000000 +0100
++++ classpath-0.98/java/util/concurrent/CopyOnWriteArrayList.java	2009-07-30 17:08:30.000000000 +0200
+@@ -147,7 +148,7 @@ public class CopyOnWriteArrayList<E> 
+    */
+   public CopyOnWriteArrayList(E[] array)
+   {
+-    data = array.clone();
++    data = (E[]) array.clone();
+   }
+ 
+   /**
+@@ -364,7 +365,7 @@ public class CopyOnWriteArrayList<E> 
+   public synchronized E set(int index, E e)
+   {
+     E result = data[index];
+-    E[] newData = data.clone();
++    E[] newData = (E[]) data.clone();
+     newData[index] = e;
+     data = newData;
+     return result;
+
+--- classpath-0.98/java/util/EnumMap.java	2007-07-24 17:26:36.000000000 +0200
++++ classpath-0.98/java/util/EnumMap.java	2009-07-30 17:12:19.000000000 +0200
+@@ -398,7 +398,7 @@ public class EnumMap<K extends Enum<K>, 
+ 	// Can't happen.
+ 	result = null;
+       }
+-    result.store = store.clone();
++    result.store = (V[]) store.clone();
+     return result;
+   }
+ 
+--- classpath-0.98/gnu/java/lang/reflect/GenericSignatureParser.java	2008-03-01 11:13:31.000000000 +0100
++++ classpath-0.98/gnu/java/lang/reflect/GenericSignatureParser.java	2009-07-30 17:14:24.000000000 +0200
+@@ -75,7 +75,7 @@ final class TypeVariableImpl extends Typ
+     public Type[] getBounds()
+     {
+         resolve(bounds);
+-        return bounds.clone();
++        return (Type[]) bounds.clone();
+     }
+ 
+     public GenericDeclaration getGenericDeclaration()
+@@ -154,7 +154,7 @@ final class ParameterizedTypeImpl extend
+ 
+     public Type[] getActualTypeArguments()
+     {
+-        return typeArgs.clone();
++        return (Type[]) typeArgs.clone();
+     }
+ 
+     public Type getRawType()
+
+--- classpath-0.98/external/jsr166/java/util/ArrayDeque.java	2006-12-10 21:25:40.000000000 +0100
++++ classpath-0.98/external/jsr166/java/util/ArrayDeque.java	2009-07-30 17:15:35.000000000 +0200
+@@ -787,7 +790,7 @@ public class ArrayDeque<E> extends Abstr
+             ArrayDeque<E> result = (ArrayDeque<E>) super.clone();
+             // Classpath local: we don't have Arrays.copyOf yet.
+             // result.elements = Arrays.copyOf(elements, elements.length);
+-            result.elements = elements.clone();
++            result.elements = (E[]) elements.clone();
+             return result;
+ 
+         } catch (CloneNotSupportedException e) {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 2053f94c103..19fea7ec2f9 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2831,6 +2831,14 @@ let
     inherit (xlibs) libX11 xf86vidmodeproto libXmu libXxf86vm;
   };
 
+  classpath = import ../development/libraries/java/classpath {
+    javac = gcj;
+    jvm = gcj;
+    inherit fetchurl stdenv pkgconfig antlr;
+    inherit (gtkLibs) gtk;
+    gconf = gnome.GConf;
+  };
+
   clearsilver = import ../development/libraries/clearsilver {
     inherit fetchurl stdenv python;
   };
diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index 8f18a79cbc4..43479a11a03 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -88,6 +88,7 @@ in {
   cdrkit = linux;
   chatzilla = linux;
   cksfv = all;
+  classpath = linux;
   clisp = linux;
   cmake = all;
   compiz = linux;