tk: fix build on darwin

pkgs/development/libraries/tk/generic.nix

@@ -9,6 +9,8 @@
   zlib,
   patches ? [ ],
   enableAqua ? stdenv.hostPlatform.isDarwin,
+  # TODO: Clean up on `staging`.
+  llvmPackages,
   ...
 }:
 
@@ -74,6 +76,10 @@ tcl.mkTclDerivation {
   ++ lib.optionals (lib.versionAtLeast tcl.version "9.0") [
     # Only used to detect the presence of zlib. Could be replaced with a stub.
     zip
+  ]
+  # TODO: Clean up on `staging`.
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    llvmPackages.lld
   ];
   buildInputs = lib.optionals (lib.versionAtLeast tcl.version "9.0") [
     zlib
@@ -89,9 +95,16 @@ tcl.mkTclDerivation {
 
   inherit tcl;
 
-  env = lib.optionalAttrs (lib.versionOlder tcl.version "8.6") {
-    NIX_CFLAGS_COMPILE = "-std=gnu17";
-  };
+  env =
+    lib.optionalAttrs (lib.versionOlder tcl.version "8.6") {
+      NIX_CFLAGS_COMPILE = "-std=gnu17";
+    }
+    // lib.optionalAttrs stdenv.hostPlatform.isDarwin {
+      # workaround for ld64 hardening issue
+      #
+      # TODO: Clean up on `staging`
+      NIX_CFLAGS_COMPILE = "-fuse-ld=lld";
+    };
 
   passthru = rec {
     inherit (tcl) release version;