diff --git a/pkgs/development/compilers/llvm/3.8/libc++/default.nix b/pkgs/development/compilers/llvm/3.8/libc++/default.nix
index 00bfb3518b1..e4da582857a 100644
--- a/pkgs/development/compilers/llvm/3.8/libc++/default.nix
+++ b/pkgs/development/compilers/llvm/3.8/libc++/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation rec {
   name = "libc++-${version}";
 
-  src = fetch "libcxx" "0i7iyzk024krda5spfpfi8jksh83yp3bxqkal0xp76ffi11bszrm";
+  src = fetch "libcxx" "0yr3fh8vj38289b9cwk37zsy7x98dcd3kjy7xxy8mg20p48lb01n";
 
   postUnpack = ''
     unpackFile ${libcxxabi.src}
diff --git a/pkgs/development/compilers/llvm/3.8/libc++abi.nix b/pkgs/development/compilers/llvm/3.8/libc++abi.nix
index ec0be51a11c..fdbc002688e 100644
--- a/pkgs/development/compilers/llvm/3.8/libc++abi.nix
+++ b/pkgs/development/compilers/llvm/3.8/libc++abi.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation {
   name = "libc++abi-${version}";
 
-  src = fetch "libcxxabi" "0ambfcmr2nh88hx000xb7yjm9lsqjjz49w5mlf6dlxzmj3nslzx4";
+  src = fetch "libcxxabi" "0175rv2ynkklbg96kpw13iwhnzyrlw3r12f4h09p9v7nmxqhivn5";
 
   buildInputs = [ cmake ] ++ stdenv.lib.optional (!stdenv.isDarwin && !stdenv.isFreeBSD) libunwind;
 
diff --git a/pkgs/development/compilers/llvm/3.8/llvm.nix b/pkgs/development/compilers/llvm/3.8/llvm.nix
index db73999719d..f586fd0c752 100644
--- a/pkgs/development/compilers/llvm/3.8/llvm.nix
+++ b/pkgs/development/compilers/llvm/3.8/llvm.nix
@@ -35,6 +35,13 @@ in stdenv.mkDerivation rec {
 
   propagatedBuildInputs = [ ncurses zlib ];
 
+  # hacky fix: New LLVM releases require a newer OS X SDK than
+  # 10.9. This is a temporary measure until nixpkgs darwin support is
+  # updated.
+  patchPhase = stdenv.lib.optionalString stdenv.isDarwin ''
+        sed -i 's/os_trace(\(.*\)");$/printf(\1\\n");/g' ./projects/compiler-rt/lib/sanitizer_common/sanitizer_mac.cc
+  '';
+
   # hacky fix: created binaries need to be run before installation
   preBuild = ''
     mkdir -p $out/