diff --git a/pkgs/development/compilers/llvm/3.8/lldb.nix b/pkgs/development/compilers/llvm/3.8/lldb.nix
index ca8a74c28bb6..8a09043051a7 100644
--- a/pkgs/development/compilers/llvm/3.8/lldb.nix
+++ b/pkgs/development/compilers/llvm/3.8/lldb.nix
@@ -25,12 +25,9 @@ stdenv.mkDerivation {
     cp "$(ls -d llvm-*.src)/lib/Support/regex_impl.h" "$srcDir/tools/lib/Support/"
   '';
 
-  buildInputs = [ cmake python which swig ncurses zlib libedit ];
+  buildInputs = [ cmake python which swig ncurses zlib libedit llvm ];
 
-  preConfigure = ''
-    export CXXFLAGS="-pthread"
-    export LDFLAGS="-ldl"
-  '';
+  hardeningDisable = [ "format" ];
 
   cmakeFlags = [
     "-DCMAKE_BUILD_TYPE=Release"