diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
index 7cd010e22d9c..1ef49d1f894f 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -8,7 +8,8 @@ in
 
 self: super: {
 
-  llvmPackages = pkgs.lib.dontRecurseIntoAttrs self.ghc.llvmPackages;
+  # Should be llvmPackages_6 which has been removed from nixpkgs
+  llvmPackages = null;
 
   # Disable GHC 8.6.x core libraries.
   array = null;
@@ -49,6 +50,9 @@ self: super: {
 
   # Need the Cabal-syntax-3.6.0.0 fake package for Cabal < 3.8 to allow callPackage and the constraint solver to work
   Cabal-syntax = self.Cabal-syntax_3_6_0_0;
+  # These core package only exist for GHC >= 9.4. The best we can do is feign
+  # their existence to callPackages, but their is no shim for lower GHC versions.
+  system-cxx-std-lib = null;
 
   # Needs Cabal 3.0.x.
   jailbreak-cabal = super.jailbreak-cabal.overrideScope (cself: _: { Cabal = cself.Cabal_3_2_1_0; });
@@ -91,7 +95,7 @@ self: super: {
   ghc-lib-parser-ex = addBuildDepend self.ghc-lib-parser super.ghc-lib-parser-ex;
 
   # This became a core library in ghc 8.10., so we don’t have an "exception" attribute anymore.
-  exceptions = super.exceptions_0_10_4;
+  exceptions = null;
 
   # Older compilers need the latest ghc-lib to build this package.
   hls-hlint-plugin = addBuildDepend self.ghc-lib super.hls-hlint-plugin;