diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index b56f921d0c2..5ba9b723edd 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -681,6 +681,11 @@ mapAliases ({
   clang_35 = llvm_4;
   clang_4 = llvm_4;
 
+  # added 2019-04-13
+  # *-polly pointed to llvmPackages_latest
+  llvm-polly = throw "clang is now built with polly-plugin by default";
+  clang-polly = throw "clang is now built with polly-plugin by default";
+
   /* Cleanup before 20.09 */
   oraclejdk8psu = throw ''
     The *psu versions of oraclejdk aren't provided by upstream anymore and were therefore removed!
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a77396bcd58..e2c43fac6d4 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8003,8 +8003,6 @@ in
       useMacosReexportHack = true;
     };
   };
-  llvm-polly = llvmPackages_latest.llvm-polly;
-  clang-polly = llvmPackages_latest.clang.override { cc = llvmPackages_latest.clang-polly-unwrapped; };
 
   clang_10 = llvmPackages_10.clang;
   clang_9  = llvmPackages_9.clang;
@@ -8801,7 +8799,7 @@ in
     stdenv = gcc7Stdenv;
   });
 
-  llvmPackages_latest = llvmPackages_9; # llvmPackages_10: when out of RC
+  llvmPackages_latest = llvmPackages_10;
 
   lorri = callPackage ../tools/misc/lorri {
     inherit (darwin.apple_sdk.frameworks) CoreServices Security;