1 files changed, 4 insertions, 6 deletions
diff --git a/nixpkgs/pkgs/development/libraries/tbb/default.nix b/nixpkgs/pkgs/development/libraries/tbb/default.nix
index 6fe4e45521ed..18f9e541acd4 100644
--- a/nixpkgs/pkgs/development/libraries/tbb/default.nix
+++ b/nixpkgs/pkgs/development/libraries/tbb/default.nix
@@ -2,19 +2,17 @@
 
 with stdenv.lib; stdenv.mkDerivation rec {
   pname = "tbb";
-  version = "2019_U8";
+  version = "2019_U9";
 
   src = fetchFromGitHub {
     owner = "01org";
     repo = "tbb";
     rev = version;
-    sha256 = "0z0kh1a5g28gckcxlv3x7qqskh5fsl8knf2ypbbvk7z9ln9k3wfq";
+    sha256 = "1a39nflw7b2n51jfp3fdprnkpgzaspzww1dckfvaigflfli9s8rj";
   };
 
-  makeFlags = concatStringsSep " " (
-    optional (compiler != null) "compiler=${compiler}" ++
-    optional (stdver != null) "stdver=${stdver}"
-  );
+  makeFlags = optional (compiler != null) "compiler=${compiler}"
+    ++ optional (stdver != null) "stdver=${stdver}";
 
   patches = stdenv.lib.optional stdenv.hostPlatform.isMusl ./glibc-struct-mallinfo.patch;