gistfile1.txt

diff --git i/default.nix w/default.nix
index 47a81e6..a0b8b95 100644
--- i/default.nix
+++ w/default.nix
@@ -15,6 +15,12 @@ with pkgs.lib;
 with pkgs.haskell.lib;
 
 let
+  haskellOverlay = hself: hsuper {
+    amazonka-s3 = pkgs.haskell.lib.appendPatch hsuper.amazonka-s3 ./iohk/amazonka-content-length.patch;
+  };
+  haskellPackages = pkgs.haskellPackages.override (old: {
+    overrides = composeExtensions (old.overrides or (_: _: {})) haskellOverlay;
+  });
   # nixopsUnstable = /path/to/local/src
   sources = commonLib.sources;
   nixopsPacketSrc = sources.nixops-packet;
@@ -45,7 +51,7 @@ let
   mantis-pkgs     = commonLib.fetchProjectPackages "mantis"     <mantis>     ./goguen/pins   mantisRevOverride  args;
   cardano-node-pkgs = import (sources.cardano-node.revOverride cardanoNodeRevOverride) {};
 
-  iohk-ops = pkgs.haskell.lib.overrideCabal
+  iohk-ops = haskellPackages.lib.overrideCabal
              (compiler.callPackage ./iohk/default.nix {})
              (drv: {
                 executableToolDepends = [ pkgs.makeWrapper ];