diff --git a/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix b/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix
index 6d10244a8795..b23c6da6123c 100644
--- a/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix
+++ b/pkgs/applications/editors/emacs-modes/emacs-clang-complete-async/default.nix
@@ -1,4 +1,4 @@
-{ clangStdenv, fetchgit, llvmFull }:
+{ clangStdenv, fetchgit, llvm, clang }:
 
 clangStdenv.mkDerivation {
   name = "emacs-clang-complete-async-20130218";
@@ -8,7 +8,7 @@ clangStdenv.mkDerivation {
     sha256 = "1c8zqi6axbsb951azz9iqx3j52j30nd9ypv396hvids3g02cirrf";
   };
 
-  buildInputs = [ llvmFull ];
+  buildInputs = [ llvm clang.clang ];
 
   installPhase = ''
     mkdir -p $out/bin
diff --git a/pkgs/development/compilers/llvm/default.nix b/pkgs/development/compilers/llvm/3.3/llvm.nix
similarity index 55%
rename from pkgs/development/compilers/llvm/default.nix
rename to pkgs/development/compilers/llvm/3.3/llvm.nix
index 73eb7135ca44..e40014a960c4 100644
--- a/pkgs/development/compilers/llvm/default.nix
+++ b/pkgs/development/compilers/llvm/3.3/llvm.nix
@@ -1,27 +1,20 @@
-{ stdenv, fetchurl, perl, groff, cmake, python, libffi, binutils, version }:
-
-with { inherit (stdenv.lib) optional optionals; };
-
-assert version == "3.4" || version == "3.3";
-
-stdenv.mkDerivation rec {
+{ stdenv, fetchurl, perl, groff, cmake, python, libffi, binutils }:
+let
+  version = "3.3";
+in stdenv.mkDerivation rec {
   name = "llvm-${version}";
 
   src = fetchurl {
-    url    = "http://llvm.org/releases/${version}/llvm-${version}.src.tar.gz";
-    sha256 =
-      if version == "3.4" then "0a169ba045r4apb9cv6ncrwl83l7yiajnzirkcdlhj1cd4nn3995"
-        else       /*3.3*/     "0y3mfbb5qzcpw3v5qncn69x1hdrrrfirgs82ypi2annhf0g6nxk8";
+    url = "http://llvm.org/releases/${version}/llvm-${version}.src.tar.gz";
+    sha256 = "0y3mfbb5qzcpw3v5qncn69x1hdrrrfirgs82ypi2annhf0g6nxk8";
   };
 
-  patches = optionals (version == "3.3") [
+  patches = [
     ./more-memory-for-bugpoint.patch # The default rlimits in 3.3 are too low for shared libraries.
     ./no-rule-aarch64.patch          # http://llvm.org/bugs/show_bug.cgi?id=16625
   ];
 
-  # libffi was propagated before, but it wasn't even being used, so
-  # unless something needs it just an input is fine.
-  buildInputs = [ perl groff cmake python libffi ]; # ToDo: polly, libc++; enable cxx11?
+  buildInputs = [ perl groff cmake python libffi ];
 
   # hacky fix: created binaries need to be run before installation
   preBuild = let LD = if stdenv.isDarwin then "DYLD" else "LD";
@@ -31,9 +24,8 @@ stdenv.mkDerivation rec {
     "-DCMAKE_BUILD_TYPE=Release"
     "-DLLVM_ENABLE_FFI=ON"
     "-DLLVM_BINUTILS_INCDIR=${binutils}/include"
-  ]
-    ++ optional (version == "3.3") "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=R600" # for mesa
-    ++ optional (!isDarwin) "-DBUILD_SHARED_LIBS=ON";
+    "-DLLVM_EXPERIMENTAL_TARGETS_TO_BUILD=R600" # for mesa
+  ] ++ stdenv.lib.optional (!isDarwin) "-DBUILD_SHARED_LIBS=ON";
 
   enableParallelBuilding = true;
 
diff --git a/pkgs/development/compilers/llvm/more-memory-for-bugpoint.patch b/pkgs/development/compilers/llvm/3.3/more-memory-for-bugpoint.patch
similarity index 100%
rename from pkgs/development/compilers/llvm/more-memory-for-bugpoint.patch
rename to pkgs/development/compilers/llvm/3.3/more-memory-for-bugpoint.patch
diff --git a/pkgs/development/compilers/llvm/no-rule-aarch64.patch b/pkgs/development/compilers/llvm/3.3/no-rule-aarch64.patch
similarity index 100%
rename from pkgs/development/compilers/llvm/no-rule-aarch64.patch
rename to pkgs/development/compilers/llvm/3.3/no-rule-aarch64.patch
diff --git a/pkgs/development/compilers/llvm/3.4/clang-separate-build.patch b/pkgs/development/compilers/llvm/3.4/clang-separate-build.patch
new file mode 100644
index 000000000000..5fb67f169f45
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/clang-separate-build.patch
@@ -0,0 +1,8 @@
+diff -Naur clang-3.4-orig/tools/extra/CMakeLists.txt clang-3.4/tools/extra/CMakeLists.txt
+--- clang-3.4-orig/tools/extra/CMakeLists.txt	2013-11-07 19:08:23.000000000 -0500
++++ clang-3.4/tools/extra/CMakeLists.txt	2014-01-20 11:47:22.678435223 -0500
+@@ -1,3 +1,4 @@
++include(CheckLibraryExists)
+ check_library_exists(edit el_init "" HAVE_LIBEDIT)
+ 
+ add_subdirectory(clang-apply-replacements)
diff --git a/pkgs/development/compilers/llvm/3.4/clang.nix b/pkgs/development/compilers/llvm/3.4/clang.nix
new file mode 100644
index 000000000000..22a1e112b9d2
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/clang.nix
@@ -0,0 +1,41 @@
+{ stdenv, fetch, cmake, libxml2, libedit, llvm, version }:
+
+stdenv.mkDerivation {
+  name = "clang-${version}";
+
+  unpackPhase = ''
+    unpackFile ${fetch "clang" "06rb4j1ifbznl3gfhl98s7ilj0ns01p7y7zap4p7ynmqnc6pia92"}
+    mv clang-${version} clang
+    sourceRoot=$PWD/clang
+    unpackFile ${fetch "clang-tools-extra" "1d1822mwxxl9agmyacqjw800kzz5x8xr0sdmi8fgx5xfa5sii1ds"}
+    mv clang-tools-extra-${version} $sourceRoot/tools/extra
+    # !!! Hopefully won't be needed for 3.5
+    unpackFile ${llvm.src}
+    export cmakeFlags="$cmakeFlags -DCLANG_PATH_TO_LLVM_SOURCE=$PWD/llvm-${version}"
+    (cd llvm-${version} && patch -Np1 -i ${./llvm-separate-build.patch})
+  '';
+
+  patches = [ ./clang-separate-build.patch ];
+
+  buildInputs = [ cmake libedit libxml2 ];
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=Release"
+    "-DGCC_INSTALL_PREFIX=${stdenv.gcc.gcc}"
+    "-DC_INCLUDE_DIRS=${stdenv.gcc.libc}/include/"
+    "-DCMAKE_CXX_FLAGS=-std=c++11"
+    "-DCLANG_PATH_TO_LLVM_BUILD=${llvm}"
+  ];
+
+  passthru.gcc = stdenv.gcc.gcc;
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "A c, c++, objective-c, and objective-c++ frontend for the llvm compiler";
+    homepage    = http://llvm.org/;
+    license     = stdenv.lib.licenses.bsd3;
+    maintainers = [ stdenv.lib.maintainers.shlevy ];
+    platforms   = stdenv.lib.platforms.all;
+  };
+}
diff --git a/pkgs/development/compilers/llvm/3.4/default.nix b/pkgs/development/compilers/llvm/3.4/default.nix
new file mode 100644
index 000000000000..0a8a72f59a96
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/default.nix
@@ -0,0 +1,25 @@
+{ newScope, stdenv, isl, fetchurl }:
+let
+  callPackage = newScope (self // { inherit stdenv isl version fetch; });
+
+  version = "3.4";
+
+  fetch = name: sha256: fetchurl {
+    url = "http://llvm.org/releases/${version}/${name}-${version}.src.tar.gz";
+    inherit sha256;
+  };
+
+  self = {
+    llvm = callPackage ./llvm.nix {};
+
+    clang = callPackage ./clang.nix {};
+
+    lld = callPackage ./lld.nix {};
+
+    lldb = callPackage ./lldb.nix {};
+
+    polly = callPackage ./polly.nix {};
+
+    dragonegg = callPackage ./dragonegg.nix {};
+  };
+in self
diff --git a/pkgs/development/compilers/llvm/dragonegg.nix b/pkgs/development/compilers/llvm/3.4/dragonegg.nix
similarity index 66%
rename from pkgs/development/compilers/llvm/dragonegg.nix
rename to pkgs/development/compilers/llvm/3.4/dragonegg.nix
index 38d3546d9819..f8ea44793de0 100644
--- a/pkgs/development/compilers/llvm/dragonegg.nix
+++ b/pkgs/development/compilers/llvm/3.4/dragonegg.nix
@@ -1,13 +1,9 @@
-{stdenv, fetchurl, llvm, gmp, mpfr, mpc, ncurses, zlib}:
+{stdenv, fetch, llvm, gmp, mpfr, mpc, ncurses, zlib, version}:
 
 stdenv.mkDerivation rec {
-  version = "3.4";
   name = "dragonegg-${version}";
 
-  src = fetchurl {
-    url = "http://llvm.org/releases/${version}/${name}.src.tar.gz";
-    sha256 = "1733czbvby1ww3xkwcwmm0km0bpwhfyxvf56wb0zv5gksp3kbgrl";
-  };
+  src = fetch "dragonegg" "1733czbvby1ww3xkwcwmm0km0bpwhfyxvf56wb0zv5gksp3kbgrl";
 
   # The gcc the plugin will be built for (the same used building dragonegg)
   GCC = "gcc";
@@ -24,7 +20,7 @@ stdenv.mkDerivation rec {
     homepage = http://dragonegg.llvm.org/;
     description = "gcc plugin that replaces gcc's optimizers and code generators by those in LLVM";
     license = "GPLv2+";
-    maintainers = with stdenv.lib.maintainers; [viric];
+    maintainers = with stdenv.lib.maintainers; [viric shlevy];
     platforms = with stdenv.lib.platforms; linux;
   };
 }
diff --git a/pkgs/development/compilers/llvm/3.4/lld.nix b/pkgs/development/compilers/llvm/3.4/lld.nix
new file mode 100644
index 000000000000..22eb02a0e35b
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/lld.nix
@@ -0,0 +1,31 @@
+{ stdenv, fetch, cmake, llvm, ncurses, zlib, python, version }:
+
+stdenv.mkDerivation {
+  name = "lld-${version}";
+
+  src = fetch "lld" "1sd4scqynryfrmcc4h0ljgwn2dgjmbbmf38z50ya6l0janpd2nxz";
+
+  preUnpack = ''
+    # !!! Hopefully won't be needed for 3.5
+    unpackFile ${llvm.src}
+    export cmakeFlags="$cmakeFlags -DLLD_PATH_TO_LLVM_SOURCE=$PWD/llvm-${version}"
+  '';
+
+  buildInputs = [ cmake ncurses zlib python ];
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=Release"
+    "-DCMAKE_CXX_FLAGS=-std=c++11"
+    "-DLLD_PATH_TO_LLVM_BUILD=${llvm}"
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "A set of modular code for creating linker tools";
+    homepage    = http://llvm.org/;
+    license     = stdenv.lib.licenses.bsd3;
+    maintainers = [ stdenv.lib.maintainers.shlevy ];
+    platforms   = stdenv.lib.platforms.all;
+  };
+}
diff --git a/pkgs/development/compilers/llvm/3.4/lldb.nix b/pkgs/development/compilers/llvm/3.4/lldb.nix
new file mode 100644
index 000000000000..7b35119a93fb
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/lldb.nix
@@ -0,0 +1,44 @@
+{ stdenv
+, fetch
+, cmake
+, zlib
+, ncurses
+, swig
+, which
+, libedit
+, llvm
+, clang
+, python
+, version
+}:
+
+stdenv.mkDerivation {
+  name = "lldb-${version}";
+
+  src = fetch "lldb" "0h8cmjrhjhigk7k2qll1pcf6jfgmbdzkzfz2i048pkfg851s0x4g";
+
+  patchPhase = ''
+    sed -i 's|/usr/bin/env||' \
+      scripts/Python/finish-swig-Python-LLDB.sh \
+      scripts/Python/build-swig-Python.sh
+  '';
+
+  buildInputs = [ cmake python which swig ncurses zlib libedit ];
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=Release"
+    "-DCMAKE_CXX_FLAGS=-std=c++11"
+    "-DLLDB_PATH_TO_LLVM_BUILD=${llvm}"
+    "-DLLDB_PATH_TO_CLANG_BUILD=${clang}"
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "A next-generation high-performance debugger";
+    homepage    = http://llvm.org/;
+    license     = stdenv.lib.licenses.bsd3;
+    maintainers = [ stdenv.lib.maintainers.shlevy ];
+    platforms   = stdenv.lib.platforms.all;
+  };
+}
diff --git a/pkgs/development/compilers/llvm/3.4/llvm-separate-build.patch b/pkgs/development/compilers/llvm/3.4/llvm-separate-build.patch
new file mode 100644
index 000000000000..abfc11513cdc
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/llvm-separate-build.patch
@@ -0,0 +1,12 @@
+diff -Naur llvm-3.4-orig/cmake/modules/TableGen.cmake llvm-3.4/cmake/modules/TableGen.cmake
+--- llvm-3.4-orig/cmake/modules/TableGen.cmake	2013-10-06 21:00:07.000000000 -0400
++++ llvm-3.4/cmake/modules/TableGen.cmake	2014-01-20 13:06:55.273022149 -0500
+@@ -78,8 +78,6 @@
+ endif()
+ 
+ macro(add_tablegen target project)
+-  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${LLVM_TOOLS_BINARY_DIR})
+-
+   set(${target}_OLD_LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS})
+   set(LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS} TableGen)
+   add_llvm_utility(${target} ${ARGN})
diff --git a/pkgs/development/compilers/llvm/3.4/llvm.nix b/pkgs/development/compilers/llvm/3.4/llvm.nix
new file mode 100644
index 000000000000..4947bdca2a96
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/llvm.nix
@@ -0,0 +1,55 @@
+{ stdenv
+, fetch
+, perl
+, groff
+, cmake
+, python
+, libffi
+, binutils
+, libxml2
+, valgrind
+, ncurses
+, version
+}:
+
+let
+  src = fetch "llvm" "0a169ba045r4apb9cv6ncrwl83l7yiajnzirkcdlhj1cd4nn3995";
+in stdenv.mkDerivation rec {
+  name = "llvm-${version}";
+
+  unpackPhase = ''
+    unpackFile ${src}
+    mv llvm-${version} llvm
+    sourceRoot=$PWD/llvm
+    unpackFile ${fetch "compiler-rt" "0p5b6varxdqn7q3n77xym63hhq4qqxd2981pfpa65r1w72qqjz7k"}
+    mv compiler-rt-${version} $sourceRoot/projects/compiler-rt
+  '';
+
+  buildInputs = [ perl groff cmake libxml2 python libffi valgrind ncurses ];
+
+  # hacky fix: created binaries need to be run before installation
+  preBuild = ''
+    mkdir -p $out/
+    ln -sv $PWD/lib $out
+  '';
+  postBuild = "rm -fR $out";
+
+  cmakeFlags = with stdenv; [
+    "-DCMAKE_BUILD_TYPE=Release"
+    "-DLLVM_ENABLE_FFI=ON"
+    "-DLLVM_BINUTILS_INCDIR=${binutils}/include"
+    "-DCMAKE_CXX_FLAGS=-std=c++11"
+  ] ++ stdenv.lib.optional (!isDarwin) "-DBUILD_SHARED_LIBS=ON";
+
+  enableParallelBuilding = true;
+
+  passthru.src = src;
+
+  meta = {
+    description = "Collection of modular and reusable compiler and toolchain technologies";
+    homepage    = http://llvm.org/;
+    license     = stdenv.lib.licenses.bsd3;
+    maintainers = with stdenv.lib.maintainers; [ shlevy lovek323 raskin viric ];
+    platforms   = stdenv.lib.platforms.all;
+  };
+}
diff --git a/pkgs/development/compilers/llvm/3.4/polly-separate-build.patch b/pkgs/development/compilers/llvm/3.4/polly-separate-build.patch
new file mode 100644
index 000000000000..618dd4dc3b12
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/polly-separate-build.patch
@@ -0,0 +1,12 @@
+diff -Naur polly-3.4-orig/CMakeLists.txt polly-3.4/CMakeLists.txt
+--- polly-3.4-orig/CMakeLists.txt	2013-11-21 06:51:46.000000000 -0500
++++ polly-3.4/CMakeLists.txt	2014-01-20 18:49:34.907919933 -0500
+@@ -53,7 +53,7 @@
+   execute_process(COMMAND "${LLVM_INSTALL_ROOT}/bin/llvm-config" --cxxflags
+                   OUTPUT_VARIABLE LLVM_CXX_FLAGS
+                   OUTPUT_STRIP_TRAILING_WHITESPACE)
+-  set(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS} ${LLVM_CXX_FLAGS})
++  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${LLVM_CXX_FLAGS}")
+ endif(NOT DEFINED LLVM_MAIN_SRC_DIR)
+ 
+ set(POLLY_SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR})
diff --git a/pkgs/development/compilers/llvm/3.4/polly.nix b/pkgs/development/compilers/llvm/3.4/polly.nix
new file mode 100644
index 000000000000..61721ffad67d
--- /dev/null
+++ b/pkgs/development/compilers/llvm/3.4/polly.nix
@@ -0,0 +1,27 @@
+{ stdenv, fetch, cmake, isl, python, gmp, llvm, version }:
+
+stdenv.mkDerivation {
+  name = "polly-${version}";
+
+  src =  fetch "polly" "1rqflmgzg1vzjm0r32c5ck8x3q0qm3g0hh8ggbjazh6x7nvmy6lz";
+
+  patches = [ ./polly-separate-build.patch ];
+
+  buildInputs = [ cmake isl python gmp ];
+
+  cmakeFlags = [
+    "-DCMAKE_BUILD_TYPE=Release"
+    "-DCMAKE_CXX_FLAGS=-std=c++11"
+    "-DLLVM_INSTALL_ROOT=${llvm}"
+  ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    description = "A polyhedral optimizer for llvm";
+    homepage    = http://llvm.org/;
+    license     = stdenv.lib.licenses.bsd3;
+    maintainers = [ stdenv.lib.maintainers.shlevy ];
+    platforms   = stdenv.lib.platforms.all;
+  };
+}
diff --git a/pkgs/development/compilers/llvm/full.nix b/pkgs/development/compilers/llvm/full.nix
deleted file mode 100644
index 9c63502d8cd0..000000000000
--- a/pkgs/development/compilers/llvm/full.nix
+++ /dev/null
@@ -1,89 +0,0 @@
-{ stdenv
-, fetchurl
-, perl, groff
-, cmake
-, libxml2
-, python
-, libffi
-, zlib
-, ncurses
-, isl
-, gmp
-, doxygen
-, binutils
-, swig
-, which
-, libedit
-, valgrind
-}:
-
-let
-  version = "3.4";
-
-  fetch = name: sha256: fetchurl {
-    url = "http://llvm.org/releases/${version}/${name}-${version}.src.tar.gz";
-    inherit sha256;
-  };
-
-  inherit (stdenv.lib) concatStrings mapAttrsToList;
-in stdenv.mkDerivation {
-  name = "llvm-full-${version}";
-
-  unpackPhase = ''
-    unpackFile ${fetch "llvm" "0a169ba045r4apb9cv6ncrwl83l7yiajnzirkcdlhj1cd4nn3995"}
-    mv llvm-${version} llvm
-    sourceRoot=$PWD/llvm
-    ${concatStrings (mapAttrsToList (name: { location, sha256 }: ''
-      unpackFile ${fetch name sha256}
-      mv ${name}-${version} $sourceRoot/${location}
-    '') {
-      clang = { location = "tools/clang"; sha256 = "06rb4j1ifbznl3gfhl98s7ilj0ns01p7y7zap4p7ynmqnc6pia92"; };
-      clang-tools-extra = { location = "tools/clang/tools/extra"; sha256 = "1d1822mwxxl9agmyacqjw800kzz5x8xr0sdmi8fgx5xfa5sii1ds"; };
-      compiler-rt = { location = "projects/compiler-rt"; sha256 = "0p5b6varxdqn7q3n77xym63hhq4qqxd2981pfpa65r1w72qqjz7k"; };
-      lld = { location = "tools/lld"; sha256 = "1sd4scqynryfrmcc4h0ljgwn2dgjmbbmf38z50ya6l0janpd2nxz"; };
-      lldb = { location = "tools/lldb"; sha256 = "0h8cmjrhjhigk7k2qll1pcf6jfgmbdzkzfz2i048pkfg851s0x4g"; };
-      polly = { location = "tools/polly"; sha256 = "1rqflmgzg1vzjm0r32c5ck8x3q0qm3g0hh8ggbjazh6x7nvmy6lz"; };
-    })}
-    sed -i 's|/usr/bin/env||' \
-      $sourceRoot/tools/lldb/scripts/Python/finish-swig-Python-LLDB.sh \
-      $sourceRoot/tools/lldb/scripts/Python/build-swig-Python.sh
-  '';
-
-  buildInputs = [ perl
-                  groff
-                  cmake
-                  libxml2
-                  python
-                  libffi
-                  zlib
-                  ncurses
-                  isl
-                  gmp
-                  doxygen
-                  swig
-                  which
-                  libedit
-                  valgrind
-                ];
-
-  cmakeFlags = [
-    "-DCMAKE_BUILD_TYPE=Release"
-    "-DLLVM_ENABLE_FFI=ON"
-    "-DGCC_INSTALL_PREFIX=${stdenv.gcc.gcc}"
-    "-DC_INCLUDE_DIRS=${stdenv.gcc.libc}/include/"
-    "-DLLVM_BINUTILS_INCDIR=${binutils}/include"
-    "-DCMAKE_CXX_FLAGS=-std=c++11"
-  ];
-
-  passthru.gcc = stdenv.gcc.gcc;
-
-  enableParallelBuilding = true;
-
-  meta = {
-    description = "Collection of modular and reusable compiler and toolchain technologies";
-    homepage    = http://llvm.org/;
-    license     = stdenv.lib.licenses.bsd3;
-    maintainers = [ stdenv.lib.maintainers.shlevy ];
-    platforms   = stdenv.lib.platforms.all;
-  };
-}
diff --git a/pkgs/development/libraries/libc++/default.nix b/pkgs/development/libraries/libc++/default.nix
index 964d3727f8f2..70da4462486d 100644
--- a/pkgs/development/libraries/libc++/default.nix
+++ b/pkgs/development/libraries/libc++/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, fetchsvn, cmake, libcxxabi }:
+{ stdenv, fetchurl, fetchsvn, cmake, libcxxabi, python }:
 
 let
   version = "3.4";
@@ -11,7 +11,7 @@ in stdenv.mkDerivation rec {
     sha256 = "1sqd5qhqj7qnn9zjxx9bv7ky4f7xgmh9sbgd53y1kszhg41217xx";
   };
 
-  buildInputs = [ cmake libcxxabi ];
+  buildInputs = [ cmake libcxxabi python ];
 
   cmakeFlags = [ "-DCMAKE_BUILD_TYPE=Release"
                  "-DLIBCXX_LIBCXXABI_INCLUDE_PATHS=${libcxxabi}/include"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 897fae64af57..d58fda4e52f5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -2298,12 +2298,9 @@ let
 
   ccl = builderDefsPackage ../development/compilers/ccl {};
 
-  clang = wrapClang llvmFull;
+  clang = wrapClang llvmPackages.clang;
 
-  llvmFullSelf = clangWrapSelf (llvmFull.override {
-
-     stdenv = libcxxStdenv;
-  });
+  clangSelf = clangWrapSelf llvmPackagesSelf.clang;
 
   clangWrapSelf = build: (import ../build-support/clang-wrapper) {
     clang = build;
@@ -2318,7 +2315,7 @@ let
 
   #Use this instead of stdenv to build with clang
   clangStdenv = lowPrio (stdenvAdapters.overrideGCC stdenv clang);
-  libcxxStdenv = stdenvAdapters.overrideGCC stdenv (clangWrapSelf llvmFull);
+  libcxxStdenv = stdenvAdapters.overrideGCC stdenv (clangWrapSelf llvmPackages.clang);
 
   clean = callPackage ../development/compilers/clean { };
 
@@ -2751,6 +2748,7 @@ let
 
   julia = callPackage ../development/compilers/julia {
     liblapack = liblapack.override {shared = true;};
+    llvm = llvm_33;
   };
 
   lazarus = builderDefsPackage (import ../development/compilers/fpc/lazarus.nix) {
@@ -2761,17 +2759,14 @@ let
 
   lessc = callPackage ../development/compilers/lessc { };
 
-  llvm = llvm_33;
-  llvm_34 = callPackage ../development/compilers/llvm {
-    version = "3.4";
+  llvm = llvmPackages.llvm;
+  llvm_33 = callPackage ../development/compilers/llvm/3.3/llvm.nix {
     stdenv = if stdenv.isDarwin
       then stdenvAdapters.overrideGCC stdenv gccApple
       else stdenv;
   };
-  llvm_33 = llvm_34.override { version = "3.3"; };
-  llvmFull = callPackage ../development/compilers/llvm/full.nix {
-    isl = isl_0_12;
-  };
+  llvmPackages = recurseIntoAttrs (import ../development/compilers/llvm/3.4 { inherit newScope stdenv fetchurl; isl = isl_0_12; });
+  llvmPackagesSelf = recurseIntoAttrs (import ../development/compilers/llvm/3.4 { inherit newScope fetchurl; isl = isl_0_12; stdenv = libcxxStdenv; });
 
   mentorToolchains = recurseIntoAttrs (
     callPackage_i686 ../development/compilers/mentor {}
@@ -3961,7 +3956,7 @@ let
 
   dssi = callPackage ../development/libraries/dssi {};
 
-  dragonegg = callPackage ../development/compilers/llvm/dragonegg.nix { llvm = llvmFull; };
+  dragonegg = llvmPackages.dragonegg;
 
   dxflib = callPackage ../development/libraries/dxflib {};
 
@@ -5084,7 +5079,7 @@ let
 
   mesaSupported = lib.elem system lib.platforms.mesaPlatforms;
 
-  mesa_original = callPackage ../development/libraries/mesa { };
+  mesa_original = callPackage ../development/libraries/mesa { llvm = llvm_33; };
   mesa_noglu = if stdenv.isDarwin
     then darwinX11AndOpenGL // { driverLink = mesa_noglu; }
     else mesa_original;