diff --git a/pkgs/development/compilers/mozart/default.nix b/pkgs/development/compilers/mozart/default.nix
new file mode 100644
index 000000000000..97634bca8ef7
--- /dev/null
+++ b/pkgs/development/compilers/mozart/default.nix
@@ -0,0 +1,89 @@
+{ lib
+, fetchFromGitHub
+, fetchurl
+, cmake
+, unzip
+, makeWrapper
+, boost
+, llvmPackages
+, llvmPackages_4
+, gmp
+, emacs
+, emacs25-nox
+, jre_headless
+, tcl
+, tk
+}:
+
+let stdenv = llvmPackages.stdenv;
+
+in stdenv.mkDerivation rec {
+  pname = "mozart2";
+  version = "2.0.1";
+  name = "${pname}-${version}";
+
+  src = fetchurl {
+    url = "https://github.com/mozart/mozart2/releases/download/v${version}/${name}-Source.zip";
+    sha256 = "1mad9z5yzzix87cdb05lmif3960vngh180s2mb66cj5gwh5h9dll";
+  };
+
+  # This is a workaround to avoid using sbt.
+  # I guess it is acceptable to fetch the bootstrapping compiler in binary form.
+  bootcompiler = fetchurl {
+    url = "https://github.com/layus/mozart2/releases/download/v2.0.0-beta.1/bootcompiler.jar";
+    sha256 = "1hgh1a8hgzgr6781as4c4rc52m2wbazdlw3646s57c719g5xphjz";
+  };
+
+  postConfigure = ''
+    cp ${bootcompiler} bootcompiler/bootcompiler.jar
+  '';
+
+  nativeBuildInputs = [ cmake makeWrapper unzip ];
+
+  # We cannot compile with both gcc and clang, but we need clang during the
+  # process, so we compile everything with clang.
+  # BUT, we need clang4 for parsing, and a more recent clang for compiling.
+  cmakeFlags = [
+    "-DCMAKE_CXX_COMPILER=${llvmPackages.clang}/bin/clang++"
+    "-DCMAKE_C_COMPILER=${llvmPackages.clang}/bin/clang"
+    "-DBoost_USE_STATIC_LIBS=OFF"
+    "-DMOZART_BOOST_USE_STATIC_LIBS=OFF"
+    "-DCMAKE_PROGRAM_PATH=${llvmPackages_4.clang}/bin"
+    # Rationale: Nix's cc-wrapper needs to see a compile flag (like -c) to
+    # infer that it is not a linking call, and stop trashing the command line
+    # with linker flags.
+    # As it does not recognise -emit-ast, we pass -c immediately overridden
+    # by -emit-ast.
+    # The remaining is just the default flags that we cannot reuse and need
+    # to repeat here.
+    "-DMOZART_GENERATOR_FLAGS='-c;-emit-ast;--std=c++0x;-Wno-invalid-noreturn;-Wno-return-type;-Wno-braced-scalar-init'"
+    # We are building with clang, as nix does not support having clang and
+    # gcc together as compilers and we need clang for the sources generation.
+    # However, clang emits tons of warnings about gcc's atomic-base library.
+    "-DCMAKE_CXX_FLAGS=-Wno-braced-scalar-init"
+  ] ++ lib.optional stdenv.isDarwin "-DCMAKE_FIND_FRAMEWORK=LAST";
+
+  fixupPhase = ''
+    wrapProgram $out/bin/oz --set OZEMACS ${emacs}/bin/emacs
+  '';
+
+  buildInputs = [
+    boost
+    llvmPackages_4.llvm
+    llvmPackages_4.clang
+    llvmPackages_4.clang-unwrapped
+    gmp
+    emacs25-nox
+    jre_headless
+    tcl
+    tk
+  ];
+
+  meta = {
+    description = "An open source implementation of Oz 3.";
+    maintainers = [ lib.maintainers.layus ];
+    license = lib.licenses.bsd2;
+    homepage = "https://mozart.github.io";
+  };
+
+}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index a837336740b1..3d4a77100d42 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -218,6 +218,8 @@ mapAliases ({
   mobile_broadband_provider_info = mobile-broadband-provider-info; # added 2018-02-25
   module_init_tools = kmod; # added 2016-04-22
   mono-zeroconf = throw "deprecated 2019-09-20: abandoned by upstream.";
+  mozart = mozart2-binary; # added 2019-09-23
+  mozart-binary = mozart2-binary; # added 2019-09-23
   mpich2 = mpich;  # added 2018-08-06
   msf = metasploit; # added 2018-04-25
   libmsgpack = msgpack; # added 2018-08-17
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6e4e3ba468e2..37a209beb430 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8238,8 +8238,9 @@ in
 
   mosml = callPackage ../development/compilers/mosml { };
 
-  mozart-binary = callPackage ../development/compilers/mozart/binary.nix { };
-  mozart = mozart-binary;
+  mozart2 = callPackage ../development/compilers/mozart { };
+
+  mozart2-binary = callPackage ../development/compilers/mozart/binary.nix { };
 
   nim = callPackage ../development/compilers/nim { };
   nrpl = callPackage ../development/tools/nrpl { };