diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 631d0b713b8e..6a1779dfe354 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -754,6 +754,14 @@ self: super: {
   # Patch to consider NIX_GHC just like xmonad does
   dyre = appendPatch super.dyre ./dyre-nix.patch;
 
+  # Fix problems with GHC >=7.8 (in compatible way)
+  mueval = let pkg = appendPatch super.mueval (pkgs.fetchpatch {
+                       url = "https://patch-diff.githubusercontent.com/raw/gwern/mueval/pull/4.patch";
+                       sha256 = "1l0jn2lbzbhx9ifbpb5g617qa0fc8fwa6kyr87pjqfxpqminsgp5";
+                     });
+           # Nix-specific workaround
+           in appendPatch pkg ./mueval-nix.patch;
+
 } // {
 
   # Not on Hackage.
diff --git a/pkgs/development/haskell-modules/lambdabot-fix-ghc78.patch b/pkgs/development/haskell-modules/lambdabot-fix-ghc78.patch
new file mode 100644
index 000000000000..0a0ed65803a0
--- /dev/null
+++ b/pkgs/development/haskell-modules/lambdabot-fix-ghc78.patch
@@ -0,0 +1,22 @@
+diff -ru3 lambdabot-5.0.1.old/State/L.hs lambdabot-5.0.1/State/L.hs
+--- lambdabot-5.0.1.old/State/L.hs	2015-04-15 03:26:04.818947594 +0300
++++ lambdabot-5.0.1/State/L.hs	2015-04-15 03:26:20.386099365 +0300
+@@ -34,7 +34,6 @@
+ import Control.Monad
+ import Control.Monad.Cont
+ import Control.Monad.Identity
+-import Control.Monad.Instances
+ import Control.Monad.Reader
+ import Control.Monad.ST.Safe
+ import Control.Monad.State
+diff -ru3 lambdabot-5.0.1.old/State/Pristine.hs lambdabot-5.0.1/State/Pristine.hs
+--- lambdabot-5.0.1.old/State/Pristine.hs	2015-04-15 03:26:04.818947594 +0300
++++ lambdabot-5.0.1/State/Pristine.hs	2015-04-15 03:26:20.386099365 +0300
+@@ -34,7 +34,6 @@
+ import Control.Monad
+ import Control.Monad.Cont
+ import Control.Monad.Identity
+-import Control.Monad.Instances
+ import Control.Monad.Reader
+ import Control.Monad.ST.Safe
+ import Control.Monad.State
diff --git a/pkgs/development/haskell-modules/mueval-nix.patch b/pkgs/development/haskell-modules/mueval-nix.patch
new file mode 100644
index 000000000000..a1f95120a1f7
--- /dev/null
+++ b/pkgs/development/haskell-modules/mueval-nix.patch
@@ -0,0 +1,23 @@
+diff --git a/Mueval/Interpreter.hs b/Mueval/Interpreter.hs
+index 29b771f..6360ee3 100644
+--- a/Mueval/Interpreter.hs
++++ b/Mueval/Interpreter.hs
+@@ -8,6 +8,7 @@ import Control.Monad.Writer (Any(..),runWriterT,tell)
+ import Data.Char (isDigit)
+ import Data.List (stripPrefix)
+ import System.Directory (copyFile, makeRelativeToCurrentDirectory, removeFile, setCurrentDirectory)
++import System.Environment (lookupEnv)
+ import System.Exit (exitFailure)
+ import System.FilePath.Posix (takeFileName)
+ import qualified Control.Exception.Extensible as E (evaluate,catch,SomeException(..))
+@@ -47,6 +48,10 @@ interpreter Options { extensions = exts, namedExtensions = nexts,
+                                   -- Explicitly adding ImplicitPrelude because of
+                                   -- http://darcsden.com/jcpetruzza/hint/issue/1
+                                   unless (null lexts) $ set [languageExtensions := (UnknownExtension "ImplicitPrelude" : lexts)]
++                                  pkgs' <- liftIO $ lookupEnv "NIX_GHC_LIBDIR"
++                                  case pkgs' of
++                                    Just pkgs -> unsafeSetGhcOption ("-package-db " ++ pkgs ++ "/package.conf.d")
++                                    Nothing -> return ()
+                                   when trust $ do
+                                     unsafeSetGhcOption "-fpackage-trust"
+                                     forM_ (trustPkgs >>= words) $ \pkg ->