diff --git a/.ghci b/.ghci
index 9fe5b987..39ca3d67 100644
--- a/.ghci
+++ b/.ghci
@@ -1,5 +1,4 @@
 :set -package ghc
 :set -package ghc-paths
 :set -i. -isrc -idist/build/autogen
-:set -XDoAndIfThenElse -XOverloadedStrings
 :set prompt "\ESC[34mλ> \ESC[m"
diff --git a/ihaskell-display/ihaskell-aeson/ihaskell-aeson.cabal b/ihaskell-display/ihaskell-aeson/ihaskell-aeson.cabal
index 91ea4197..f970527e 100644
--- a/ihaskell-display/ihaskell-aeson/ihaskell-aeson.cabal
+++ b/ihaskell-display/ihaskell-aeson/ihaskell-aeson.cabal
@@ -51,10 +51,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6 && <4.10,
diff --git a/ihaskell-display/ihaskell-blaze/ihaskell-blaze.cabal b/ihaskell-display/ihaskell-blaze/ihaskell-blaze.cabal
index 9031f3f3..85c3f309 100644
--- a/ihaskell-display/ihaskell-blaze/ihaskell-blaze.cabal
+++ b/ihaskell-display/ihaskell-blaze/ihaskell-blaze.cabal
@@ -55,10 +55,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6,
diff --git a/ihaskell-display/ihaskell-charts/ihaskell-charts.cabal b/ihaskell-display/ihaskell-charts/ihaskell-charts.cabal
index 70e8ec10..5331e924 100644
--- a/ihaskell-display/ihaskell-charts/ihaskell-charts.cabal
+++ b/ihaskell-display/ihaskell-charts/ihaskell-charts.cabal
@@ -52,10 +52,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6,
diff --git a/ihaskell-display/ihaskell-diagrams/ihaskell-diagrams.cabal b/ihaskell-display/ihaskell-diagrams/ihaskell-diagrams.cabal
index ca0d5463..7a66c1f9 100644
--- a/ihaskell-display/ihaskell-diagrams/ihaskell-diagrams.cabal
+++ b/ihaskell-display/ihaskell-diagrams/ihaskell-diagrams.cabal
@@ -53,10 +53,6 @@ library
   -- Modules included in this library but not exported.
   other-modules:       IHaskell.Display.Diagrams.Animation
   
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
-             
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6 && <4.10,
                        text,
diff --git a/ihaskell-display/ihaskell-gnuplot/ihaskell-gnuplot.cabal b/ihaskell-display/ihaskell-gnuplot/ihaskell-gnuplot.cabal
index 069718d0..43e9ee57 100644
--- a/ihaskell-display/ihaskell-gnuplot/ihaskell-gnuplot.cabal
+++ b/ihaskell-display/ihaskell-gnuplot/ihaskell-gnuplot.cabal
@@ -52,10 +52,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6 && <4.10,
diff --git a/ihaskell-display/ihaskell-juicypixels/ihaskell-juicypixels.cabal b/ihaskell-display/ihaskell-juicypixels/ihaskell-juicypixels.cabal
index ebe18143..7b1e538c 100644
--- a/ihaskell-display/ihaskell-juicypixels/ihaskell-juicypixels.cabal
+++ b/ihaskell-display/ihaskell-juicypixels/ihaskell-juicypixels.cabal
@@ -58,10 +58,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6,
diff --git a/ihaskell-display/ihaskell-magic/ihaskell-magic.cabal b/ihaskell-display/ihaskell-magic/ihaskell-magic.cabal
index 66cfc1a0..abc7d228 100644
--- a/ihaskell-display/ihaskell-magic/ihaskell-magic.cabal
+++ b/ihaskell-display/ihaskell-magic/ihaskell-magic.cabal
@@ -55,10 +55,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6 && <4.10,
diff --git a/ihaskell-display/ihaskell-plot/ihaskell-plot.cabal b/ihaskell-display/ihaskell-plot/ihaskell-plot.cabal
index b6946f34..cc5089ec 100644
--- a/ihaskell-display/ihaskell-plot/ihaskell-plot.cabal
+++ b/ihaskell-display/ihaskell-plot/ihaskell-plot.cabal
@@ -52,10 +52,6 @@ library
   
   -- Modules included in this library but not exported.
   -- other-modules:       
-  
-  -- Language extensions.
-  default-extensions: DoAndIfThenElse
-              OverloadedStrings
              
   -- Other library packages from which modules are imported.
   build-depends:       base >=4.6,
diff --git a/ihaskell.cabal b/ihaskell.cabal
index dc20c7d7..0030582f 100644
--- a/ihaskell.cabal
+++ b/ihaskell.cabal
@@ -121,12 +121,6 @@ library
                    IHaskellPrelude
                    StringUtils
 
-  default-extensions:
-      NoImplicitPrelude
-      DoAndIfThenElse
-      OverloadedStrings
-      ExtendedDefaultRules
-
 executable ihaskell
   -- .hs or .lhs file containing the Main module.
   main-is:             Main.hs
@@ -156,12 +150,6 @@ executable ihaskell
   if flag(binPkgDb)
     build-depends:       bin-package-db
 
-  default-extensions:
-      NoImplicitPrelude
-      DoAndIfThenElse
-      OverloadedStrings
-      ExtendedDefaultRules
-
 Test-Suite hspec
     Type: exitcode-stdio-1.0
     Ghc-Options: -threaded
@@ -191,11 +179,6 @@ Test-Suite hspec
     if flag(binPkgDb)
         build-depends: bin-package-db
 
-    default-extensions:
-        DoAndIfThenElse
-        OverloadedStrings
-        ExtendedDefaultRules
-
 source-repository head
   type:     git
   location: git://github.com/gibiansky/IHaskell.git
diff --git a/main/IHaskellPrelude.hs b/main/IHaskellPrelude.hs
index da618fad..a49b1ae6 100644
--- a/main/IHaskellPrelude.hs
+++ b/main/IHaskellPrelude.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE CPP #-}
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}{-# LANGUAGE CPP #-}
 module IHaskellPrelude (
   module IHaskellPrelude,
   module X,
diff --git a/main/Main.hs b/main/Main.hs
index 2b744465..030621b0 100644
--- a/main/Main.hs
+++ b/main/Main.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 {-# LANGUAGE CPP, ScopedTypeVariables #-}
 
 -- | Description : Argument parsing and basic messaging loop, using Haskell
diff --git a/src/IHaskell/Eval/Widgets.hs b/src/IHaskell/Eval/Widgets.hs
index ce10e448..6eb97e71 100644
--- a/src/IHaskell/Eval/Widgets.hs
+++ b/src/IHaskell/Eval/Widgets.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 module IHaskell.Eval.Widgets (
     widgetSendOpen,
     widgetSendView,
diff --git a/src/IHaskell/Flags.hs b/src/IHaskell/Flags.hs
index 59b74e24..2ba9d9aa 100644
--- a/src/IHaskell/Flags.hs
+++ b/src/IHaskell/Flags.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 {-# LANGUAGE NoImplicitPrelude, DeriveFunctor #-}
 
 module IHaskell.Flags (
diff --git a/src/IHaskell/IPython.hs b/src/IHaskell/IPython.hs
index 580a4f48..02607c4a 100644
--- a/src/IHaskell/IPython.hs
+++ b/src/IHaskell/IPython.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 {-# LANGUAGE CPP #-}
 
 -- | Description : Shell scripting wrapper using @Shelly@ for the @notebook@, and
diff --git a/src/IHaskell/Publish.hs b/src/IHaskell/Publish.hs
index 9b7818c8..0291b7bf 100644
--- a/src/IHaskell/Publish.hs
+++ b/src/IHaskell/Publish.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 module IHaskell.Publish (publishResult) where
 
 import           IHaskellPrelude
diff --git a/src/IHaskell/Types.hs b/src/IHaskell/Types.hs
index fe8e1409..130a305e 100644
--- a/src/IHaskell/Types.hs
+++ b/src/IHaskell/Types.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 {-# LANGUAGE DeriveDataTypeable #-}
 {-# LANGUAGE DeriveGeneric #-}
 {-# LANGUAGE ExistentialQuantification #-}
diff --git a/src/IHaskellPrelude.hs b/src/IHaskellPrelude.hs
index da618fad..9bc5fbde 100644
--- a/src/IHaskellPrelude.hs
+++ b/src/IHaskellPrelude.hs
@@ -1,3 +1,4 @@
+{-# language NoImplicitPrelude, DoAndIfThenElse, OverloadedStrings, ExtendedDefaultRules #-}
 {-# LANGUAGE CPP #-}
 module IHaskellPrelude (
   module IHaskellPrelude,