diff --git a/pkgs/development/libraries/ncurses/default.nix b/pkgs/development/libraries/ncurses/default.nix
index 538c136a042..051d29924df 100644
--- a/pkgs/development/libraries/ncurses/default.nix
+++ b/pkgs/development/libraries/ncurses/default.nix
@@ -4,8 +4,8 @@
 , gpm ? null
 
 # Extra Options
+, abiVersion ? "5"
 , unicode ? true
-, abiVersion ? null
 }:
 
 let
@@ -35,6 +35,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ optGpm ];
 
   configureFlags = [
+    (mkWith   true        "abi-version" abiVersion)
     (mkWith   true        "cxx"         null)
     (mkWith   true        "cxx-binding" null)
     (mkWith   false       "ada"         null)
@@ -56,7 +57,7 @@ stdenv.mkDerivation rec {
     (mkEnable unicode     "widec"       null)
     (mkEnable true        "ext-colors"  null)
     (mkEnable true        "ext-mouse"   null)
-  ] ++ stdenv.lib.optional (abiVersion != null) (mkWith true "abi-version" abiVersion);
+  ];
 
   # PKG_CONFIG_LIBDIR is where the *.pc files will be installed. If this
   # directory doesn't exist, the configure script will disable installation of
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c8c4c716a25..e3dd92a1e08 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7241,10 +7241,6 @@ let
 
   ncurses = callPackage ../development/libraries/ncurses { };
 
-  ncurses5 = callPackage ../development/libraries/ncurses {
-    abiVersion = "5";
-  };
-
   neon = callPackage ../development/libraries/neon {
     compressionSupport = true;
     sslSupport = true;
diff --git a/pkgs/top-level/haskell-ng.nix b/pkgs/top-level/haskell-ng.nix
index f068b8b9a12..73c0abd4726 100644
--- a/pkgs/top-level/haskell-ng.nix
+++ b/pkgs/top-level/haskell-ng.nix
@@ -9,13 +9,11 @@ rec {
     ghc6102Binary = callPackage ../development/compilers/ghc/6.10.2-binary.nix { gmp = pkgs.gmp4; };
     ghc704Binary = callPackage ../development/compilers/ghc/7.0.4-binary.nix ({
       gmp = pkgs.gmp4;
-      ncurses = pkgs.ncurses5;
     } // stdenv.lib.optionalAttrs stdenv.isDarwin {
       libiconv = pkgs.darwin.libiconv;
     });
     ghc742Binary = callPackage ../development/compilers/ghc/7.4.2-binary.nix ({
       gmp = pkgs.gmp4;
-      ncurses = pkgs.ncurses5;
     } // stdenv.lib.optionalAttrs stdenv.isDarwin {
       libiconv = pkgs.darwin.libiconv;
     });