diff --git a/pkgs/tools/misc/contacts/default.nix b/pkgs/tools/misc/contacts/default.nix
index 08ba484f51ee..175b7a9ed247 100644
--- a/pkgs/tools/misc/contacts/default.nix
+++ b/pkgs/tools/misc/contacts/default.nix
@@ -11,6 +11,11 @@ stdenv.mkDerivation {
     hash = "sha256-Li/c5uf9rfpuU+hduuSm7EmhVwIIkS72dqzmN+0cE3A=";
   };
 
+  postPatch = ''
+    substituteInPlace contacts.m \
+      --replace "int peopleSort" "long peopleSort"
+  '';
+
   nativeBuildInputs = [ xcbuildHook ];
   buildInputs = [ Foundation AddressBook ];
 
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 12684c39e4b8..1c79b8a74a95 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1027,6 +1027,8 @@ mapAliases ({
   ### X ###
 
   xbmc-retroarch-advanced-launchers = kodi-retroarch-advanced-launchers; # Added 2021-11-19
+  xcbuild6Hook = throw "'xcbuild6Hook has been renamed to/replaced by 'xcbuildHook'"; # Added 2023-12-10
+  xcodebuild6 = throw "'xcodebuild6' has been renamed to/replaced by 'xcodebuild'"; # Added 2023-12-10
   xdg_utils = xdg-utils; # Added 2021-02-01
   xineLib = xine-lib; # Added 2021-04-27
   xineUI = xine-ui; # Added 2021-04-27
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 80a52672b31f..eb7f1a72e796 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4922,7 +4922,6 @@ with pkgs;
 
   contacts = callPackage ../tools/misc/contacts {
     inherit (darwin.apple_sdk.frameworks) Foundation AddressBook;
-    xcbuildHook = xcbuild6Hook;
   };
 
   colorls = callPackage ../tools/system/colorls { };
@@ -20389,19 +20388,12 @@ with pkgs;
   xcodebuild = callPackage ../development/tools/xcbuild/wrapper.nix {
     inherit (darwin.apple_sdk.frameworks) CoreServices CoreGraphics ImageIO;
   };
-  xcodebuild6 = xcodebuild.override { stdenv = llvmPackages_6.stdenv; };
   xcbuild = xcodebuild;
   xcbuildHook = makeSetupHook {
     name = "xcbuild-hook";
     propagatedBuildInputs = [ xcbuild ];
   } ../development/tools/xcbuild/setup-hook.sh  ;
 
-  # xcbuild with llvm 6
-  xcbuild6Hook = makeSetupHook {
-    name = "xcbuild6-hook";
-    propagatedBuildInputs = [ xcodebuild6 ];
-  } ../development/tools/xcbuild/setup-hook.sh  ;
-
   xcpretty = callPackage ../development/tools/xcpretty { };
 
   xeus = callPackage ../development/libraries/xeus { };