diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index a81e91c1a24a..bebf60d32af3 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -388,6 +388,7 @@ mapAliases {
   biff = throw "biff has been renamed to/replaced by 'bttf'"; # Added 2026-06-04
   bindle = throw "bindle has been removed since it is vulnerable to CVE-2025-62518 and upstream has been archived"; # Added 2025-10-24
   binserve = throw "'binserve' has been removed because it is unmaintained upstream."; # Added 2025-11-29
+  binutilsDualAs = throw "binutilsDualAs has been removed because it was only useful on `x86_64-darwin` and also only useful for the GNAT bootstrap and also not even used for that any more and actually what on earth were you using this thing for anyway?"; # Added 2026-06-27
   bitbucket-server-cli = throw "bitbucket-server-cli has been removed due to lack of maintenance upstream."; # Added 2025-05-27
   bitcoin-abc = throw "bitcoin-abc has been removed due to a lack of maintanance"; # Added 2025-06-17
   bitcoind-abc = throw "bitcoind-abc has been removed due to a lack of maintanance"; # Added 2025-06-17
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index bec7387a745c..a8f8f3e967a2 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4987,11 +4987,6 @@ with pkgs;
     bintools = bintools-unwrapped;
   };
 
-  bintoolsDualAs = wrapBintoolsWith {
-    bintools = darwin.binutilsDualAs-unwrapped;
-    wrapGas = true;
-  };
-
   black = with python3Packages; toPythonApplication black;
 
   black-macchiato = with python3Packages; toPythonApplication black-macchiato;
diff --git a/pkgs/top-level/darwin-aliases.nix b/pkgs/top-level/darwin-aliases.nix
index 96aab9d0af29..72a7dbc9434a 100644
--- a/pkgs/top-level/darwin-aliases.nix
+++ b/pkgs/top-level/darwin-aliases.nix
@@ -103,6 +103,8 @@ stubs
 
   ### B ###
 
+  binutilsDualAs = throw "binutilsDualAs has been removed because it was only useful on `x86_64-darwin` and also only useful for the GNAT bootstrap and also not even used for that any more and actually what on earth were you using this thing for anyway?"; # Added 2026-06-27
+  binutilsDualAs-unwrapped = throw "binutilsDualAs has been removed because it was only useful on `x86_64-darwin` and also only useful for the GNAT bootstrap and also not even used for that any more and actually what on earth were you using this thing for anyway?"; # Added 2026-06-27
   builder = throw "'darwin.builder' has been changed and renamed to 'darwin.linux-builder'. The default ssh port is now 31022. Please update your configuration or override the port back to 22. See https://nixos.org/manual/nixpkgs/unstable/#sec-darwin-builder"; # added 2023-07-06
   bsdmake = pkgs.bmake; # added 2024-10-03
 
diff --git a/pkgs/top-level/darwin-packages.nix b/pkgs/top-level/darwin-packages.nix
index 5010f2658c7e..33e09e254c43 100644
--- a/pkgs/top-level/darwin-packages.nix
+++ b/pkgs/top-level/darwin-packages.nix
@@ -69,32 +69,6 @@ makeScopeWithSplicing' {
         bintools = self.binutils-unwrapped;
       };
 
-      # x86-64 Darwin gnat-bootstrap emits assembly
-      # with MOVQ as the mnemonic for quadword interunit moves
-      # such as `movq %rbp, %xmm0`.
-      # The clang integrated assembler recognises this as valid,
-      # but unfortunately the cctools.gas GNU assembler does not;
-      # it instead uses MOVD as the mnemonic.
-      # The assembly that a GCC build emits is determined at build time
-      # and cannot be changed afterwards.
-      #
-      # To build GNAT on x86-64 Darwin, therefore,
-      # we need both the clang _and_ the cctools.gas assemblers to be available:
-      # the former to build at least the stage1 compiler,
-      # and the latter at least to be detectable
-      # as the target for the final compiler.
-      binutilsDualAs-unwrapped = buildEnv {
-        name = "${lib.getName self.binutils-unwrapped}-dualas-${lib.getVersion self.binutils-unwrapped}";
-        paths = [
-          self.binutils-unwrapped
-          (lib.getOutput "gas" cctools)
-        ];
-      };
-
-      binutilsDualAs = self.binutils.override {
-        bintools = self.binutilsDualAs-unwrapped;
-      };
-
       sourceRelease = self.callPackage ../os-specific/darwin/sourceRelease { };
 
       inherit (self.file_cmds) xattr;