1 files changed, 7 insertions, 1 deletions
diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
index 9925a5c03c89..9bd45c9887f1 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
@@ -36,6 +36,13 @@ self: super: {
   unix = null;
   xhtml = null;
 
+  # These are now core libraries in GHC 8.4.x.
+  mtl = self.mtl_2_2_2;
+  parsec = self.parsec_3_1_13_0;
+  parsec_3_1_13_0 = addBuildDepends super.parsec_3_1_13_0 [self.fail self.semigroups];
+  stm = self.stm_2_4_5_0;
+  text = self.text_1_2_3_0;
+
   # Build jailbreak-cabal with the latest version of Cabal.
   jailbreak-cabal = super.jailbreak-cabal.override { Cabal = self.Cabal_1_24_2_0; };
 
@@ -195,7 +202,6 @@ self: super: {
   mono-traversable = addBuildDepend super.mono-traversable self.semigroups;
   natural-transformation = addBuildDepend super.natural-transformation self.semigroups;
   optparse-applicative = addBuildDepends super.optparse-applicative [self.semigroups self.fail];
-  parsec = addBuildDepends super.parsec [self.fail self.semigroups];
   parser-combinators = addBuildDepend super.parser-combinators self.semigroups;
   QuickCheck = addBuildDepend super.QuickCheck self.semigroups;
   reflection = addBuildDepend super.reflection self.semigroups;