diff --git a/pkgs/development/compilers/llvm/3.5/llvm.nix b/pkgs/development/compilers/llvm/3.5/llvm.nix
index bacd0b26643e..7e11caa66f0f 100644
--- a/pkgs/development/compilers/llvm/3.5/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.5/llvm.nix
@@ -41,6 +41,7 @@ in stdenv.mkDerivation rec {
     "-DCMAKE_BUILD_TYPE=Release"
     "-DLLVM_BUILD_TESTS=ON"
     "-DLLVM_ENABLE_FFI=ON"
+    "-DLLVM_REQUIRES_RTTI=1"
   ] ++ stdenv.lib.optionals (!isDarwin) [
     "-DBUILD_SHARED_LIBS=ON"
     "-DLLVM_BINUTILS_INCDIR=${binutils}/include"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 89725294bdb1..98f460313052 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3735,6 +3735,7 @@ let
 
   llvm = llvmPackages.llvm;
 
+  llvm_35 = llvmPackages_35.llvm;
   llvm_34 = llvmPackages_34.llvm;
   llvm_33 = llvm_v ../development/compilers/llvm/3.3/llvm.nix;