diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable.nix b/pkgs/development/haskell-modules/cabal2nix-unstable.nix
index 1ec16eaf5eb..00bd9061f01 100644
--- a/pkgs/development/haskell-modules/cabal2nix-unstable.nix
+++ b/pkgs/development/haskell-modules/cabal2nix-unstable.nix
@@ -8,10 +8,10 @@
 }:
 mkDerivation {
   pname = "cabal2nix";
-  version = "unstable-2021-05-06";
+  version = "unstable-2021-05-28";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/b598bc4682b0827554b5780acdd6f948d320283b.tar.gz";
-    sha256 = "04afm56cyhj2l41cvq4z11k92jjchr21a8vg9pjaz438pma7jgw1";
+    url = "https://github.com/NixOS/cabal2nix/archive/5fb325e094af91328e02cc2ecfd211feaeb135a7.tar.gz";
+    sha256 = "1zbd336s99rgk24yjqlp012d0f66s5nf190sjmsl7mfhqx9j2y4l";
   };
   isLibrary = true;
   isExecutable = true;
diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
index 8faaff9ddc5..ad6dd7115ae 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
@@ -1675,7 +1675,6 @@ broken-packages:
   - grasp
   - gray-code
   - greencard
-  - greenclip
   - greg-client
   - gremlin-haskell
   - Grempa
diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index 95399b7ba50..198ce1cc4a5 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -41557,7 +41557,7 @@ self: {
        license = lib.licenses.bsd3;
        hydraPlatforms = lib.platforms.none;
        broken = true;
-     }) {wlc = null;};
+     }) {inherit (pkgs) wlc;};
 
   "bindings-yices" = callPackage
     ({ mkDerivation, base, gmp, yices }:
@@ -110752,9 +110752,9 @@ self: {
 
   "greenclip" = callPackage
     ({ mkDerivation, base, binary, bytestring, directory, exceptions
-     , hashable, libXau, microlens, microlens-mtl, protolude, text
-     , tomland, unix, vector, wordexp, X11, xcb, xdmcp, xlibsWrapper
-     , xscrnsaver
+     , hashable, libXau, libXScrnSaver, microlens, microlens-mtl
+     , protolude, text, tomland, unix, vector, wordexp, X11, xcb, xdmcp
+     , xlibsWrapper
      }:
      mkDerivation {
        pname = "greenclip";
@@ -110767,14 +110767,12 @@ self: {
          microlens-mtl protolude text tomland unix vector wordexp X11
        ];
        executablePkgconfigDepends = [
-         libXau xcb xdmcp xlibsWrapper xscrnsaver
+         libXau libXScrnSaver xcb xdmcp xlibsWrapper
        ];
        description = "Simple clipboard manager to be integrated with rofi";
        license = lib.licenses.bsd3;
-       hydraPlatforms = lib.platforms.none;
-       broken = true;
-     }) {inherit (pkgs.xorg) libXau; xcb = null; xdmcp = null; 
-         inherit (pkgs) xlibsWrapper; xscrnsaver = null;};
+     }) {inherit (pkgs.xorg) libXScrnSaver; inherit (pkgs.xorg) libXau; 
+         xcb = null; xdmcp = null; inherit (pkgs) xlibsWrapper;};
 
   "greg-client" = callPackage
     ({ mkDerivation, base, binary, bytestring, clock, hostname, network
@@ -280222,7 +280220,7 @@ self: {
        description = "Haskell bindings for the wlc library";
        license = lib.licenses.isc;
        hydraPlatforms = lib.platforms.none;
-     }) {wlc = null;};
+     }) {inherit (pkgs) wlc;};
 
   "wobsurv" = callPackage
     ({ mkDerivation, aeson, attoparsec, base-prelude, bytestring