diff --git a/pkgs/development/compilers/llvm/3.4/llvm.nix b/pkgs/development/compilers/llvm/3.4/llvm.nix
index 9ee63ee319f1..45c8b84178c4 100644
--- a/pkgs/development/compilers/llvm/3.4/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.4/llvm.nix
@@ -25,7 +25,7 @@ in stdenv.mkDerivation rec {
     mv compiler-rt-${version} $sourceRoot/projects/compiler-rt
   '';
 
-  buildInputs = [ perl groff cmake libxml2 python libffi valgrind ncurses ];
+  buildInputs = [ perl groff cmake libxml2 python libffi ncurses ] ++ stdenv.lib.optional stdenv.isLinux valgrind;
 
   # hacky fix: created binaries need to be run before installation
   preBuild = ''
@@ -50,6 +50,6 @@ in stdenv.mkDerivation rec {
     homepage    = http://llvm.org/;
     license     = stdenv.lib.licenses.bsd3;
     maintainers = with stdenv.lib.maintainers; [ shlevy lovek323 raskin viric ];
-    platforms   = stdenv.lib.platforms.linux;
+    platforms   = stdenv.lib.platforms.all;
   };
 }