suitable clang stdenv

pkgs/applications/version-management/subversion/default.nix

@@ -15,7 +15,7 @@ assert httpServer -> httpd != null;
 assert pythonBindings -> swig != null && python != null;
 assert javahlBindings -> jdk != null && perl != null;
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (rec {
 
   version = "1.8.10";
 
@@ -73,14 +73,15 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  # Hack to build on Mac OS X. The system header files use C99-style
-  # comments, but Subversion passes -std=c90.
-  NIX_CFLAGS_COMPILE = "-std=c99";
-
   meta = {
     description = "A version control system intended to be a compelling replacement for CVS in the open source community";
     homepage = http://subversion.apache.org/;
     maintainers = with stdenv.lib.maintainers; [ eelco lovek323 ];
     hydraPlatforms = stdenv.lib.platforms.linux ++ stdenv.lib.platforms.darwin;
   };
-}
+} // stdenv.lib.optionalAttrs stdenv.isDarwin {
+  CXX = "clang++";
+  CC = "clang";
+  CPP = "clang -E";
+  CXXCPP = "clang++ -E";
+})