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-rw-r--r--pkgs/development/libraries/haskell/Crypto/default.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/development/libraries/haskell/Crypto/default.nix b/pkgs/development/libraries/haskell/Crypto/default.nix
index 0adb00ccc8624..01bc1a1a01265 100644
--- a/pkgs/development/libraries/haskell/Crypto/default.nix
+++ b/pkgs/development/libraries/haskell/Crypto/default.nix
@@ -7,6 +7,7 @@ cabal.mkDerivation (self: {
   isLibrary = true;
   isExecutable = true;
   buildDepends = [ HUnit QuickCheck random ];
+  patches = [ ./class-constraints.diff ];
   meta = {
     description = "Collects together existing Haskell cryptographic functions into a package";
     license = "unknown";