diff --git a/pkgs/development/interpreters/maude/unstable.nix b/pkgs/development/interpreters/maude/unstable.nix
new file mode 100644
index 000000000000..8cf9535af617
--- /dev/null
+++ b/pkgs/development/interpreters/maude/unstable.nix
@@ -0,0 +1,30 @@
+{ stdenv, fetchurl, flex, bison, ncurses, buddy, tecla, gmp }:
+
+stdenv.mkDerivation rec
+{
+  name = "maude-2.4-alpha-91";
+  meta =
+  {
+    homepage = "http://maude.cs.uiuc.edu/";
+    description = "Maude -- a high-level specification language";
+    license = "GPLv2";
+  };
+  src = fetchurl
+  {
+    url = "http://www.csl.sri.com/users/eker/Maude/Alpha91/Maude-2.4.tar.gz";
+    sha256 = "1nzxj8x1379nxsdvldqy55wl513hdi4xwf8i2bhngz7s8228vs37";
+  };
+  fullMaude = fetchurl
+  {
+    url = "http://www.lcc.uma.es/~duran/FullMaude/FM23j/full-maude.maude";
+    sha256 = "2b069a351d39098d11e75dd9e5b772e0cf35843bf25f5dde45f6b700dd6445f4";
+  };
+  buildInputs = [flex bison ncurses buddy tecla gmp];
+  configurePhase = ''./configure --disable-dependency-tracking --prefix=$out TECLA_LIBS="-ltecla -lncursesw" CFLAGS="-O3" CXXFLAGS="-O3"'';
+  doCheck = true;
+  postInstall =
+  ''
+    ensureDir $out/share/maude
+    cp src/Main/*.maude ${fullMaude} $out/share/maude/
+  '';
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 1f55d0de963b..77cdfd9189a3 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1838,6 +1838,10 @@ let pkgs = rec {
     inherit fetchurl stdenv flex bison ncurses buddy tecla gmp;
   };
 
+  maudeUnstable = import ../development/interpreters/maude/unstable.nix {
+    inherit fetchurl stdenv flex bison ncurses buddy tecla gmp;
+  };
+
   octave = import ../development/interpreters/octave {
     inherit stdenv fetchurl readline ncurses perl flex;
     g77 = g77_42;
@@ -1868,10 +1872,10 @@ let pkgs = rec {
   };
 
   pltScheme = builderDefsPackage (import ../development/interpreters/plt-scheme) {
-    inherit cairo fontconfig freetype libjpeg libpng openssl 
+    inherit cairo fontconfig freetype libjpeg libpng openssl
       perl mesa zlib which;
-    inherit (xorg) libX11 libXaw libXft libXrender libICE xproto 
-      renderproto pixman libSM libxcb libXext xextproto libXmu 
+    inherit (xorg) libX11 libXaw libXft libXrender libICE xproto
+      renderproto pixman libSM libxcb libXext xextproto libXmu
       libXt;
   } null;