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 b2e9d43ef08f..42712df3295b 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix
@@ -44,4 +44,17 @@ self: super: {
   # Use to be a core-library, but no longer is since GHC 8.4.x.
   hoopl = self.hoopl_3_10_2_2;
 
+  # lts-12.x versions do not compile.
+  primitive = self.primitive_0_6_4_0;
+  tagged = self.tagged_0_8_6;
+
+  # Over-specified constraints.
+  async = doJailbreak super.async;                           # base >=4.3 && <4.12, stm >=2.2 && <2.5
+  ChasingBottoms = doJailbreak super.ChasingBottoms;         # base >=4.2 && <4.12, containers >=0.3 && <0.6
+  hashable = doJailbreak super.hashable;                     # base >=4.4 && <4.1
+  hashable-time = doJailbreak super.hashable-time;           # base >=4.7 && <4.12
+  integer-logarithms = doJailbreak super.integer-logarithms; # base >=4.3 && <4.12
+  tar = doJailbreak super.tar;                               # containers >=0.2 && <0.6
+  test-framework = doJailbreak super.test-framework;         # containers >=0.1 && <0.6
+
 }