diff --git a/pkgs/applications/editors/kdevelop/default.nix b/pkgs/applications/editors/kdevelop/default.nix
index 1b72f8f0b7fb..e5b749c37947 100644
--- a/pkgs/applications/editors/kdevelop/default.nix
+++ b/pkgs/applications/editors/kdevelop/default.nix
@@ -1,18 +1,23 @@
 { stdenv, fetchurl, kdevplatform, cmake, pkgconfig, automoc4, shared_mime_info,
-  kdebase_workspace, gettext, perl }:
+  kdebase_workspace, gettext, perl, kdeutils, kdesdk }:
 
+let
+  okteta = if kdeutils ? okteta then kdeutils.okteta else kdesdk.okteta;
+in
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
-  version = "4.0.2";
+  version = "4.2.3";
   pname = "kdevelop";
 
   src = fetchurl {
     url = "mirror://kde/stable/${pname}/${version}/src/${name}.tar.bz2";
-    sha256 = "1y8ydx0fcmsab31qf5id5r5fcmp3j2l8mibvbbjfy66xgxarmnpc";
+    sha256 = "0ay3d2s5442pvdsx9lyfzb986kh6848qhbls9ff982f0glzqdcya";
   };
 
   buildInputs = [ kdevplatform cmake pkgconfig automoc4 shared_mime_info
-    kdebase_workspace gettext stdenv.gcc.libc perl ];
+    kdebase_workspace gettext stdenv.gcc.libc perl okteta ];
+
+  NIX_CFLAGS_COMPILE = "-I${okteta}/include/KDE";
 
   meta = with stdenv.lib; {
     maintainers = [ maintainers.urkud ];
diff --git a/pkgs/development/libraries/kdevplatform/default.nix b/pkgs/development/libraries/kdevplatform/default.nix
index be0e9a44ae83..7f28877b9f4f 100644
--- a/pkgs/development/libraries/kdevplatform/default.nix
+++ b/pkgs/development/libraries/kdevplatform/default.nix
@@ -1,16 +1,19 @@
 { stdenv, fetchurl, cmake, kdelibs, subversion, qt4, automoc4, perl, phonon,
-  gettext, pkgconfig, apr, aprutil, boost }:
+  gettext, pkgconfig, apr, aprutil, boost, qjson }:
 
 stdenv.mkDerivation rec {
-  name = "kdevplatform-1.0.2";
+  name = "kdevplatform-1.2.3";
 
   src = fetchurl {
-    url = "mirror://kde/stable/kdevelop/4.0.2/src/${name}.tar.bz2";
-    sha256 = "0yn4v3jx1dks84nvi7s40a1pmnvipqx5hlbvbmdgqhhpqik5y9qg";
+    url = "mirror://kde/stable/kdevelop/4.2.3/src/${name}.tar.bz2";
+    sha256 = "1h55lh7kkb8d9qgf4yyzmdwn7vq8l49lzlq92jccz7p79lxb2s08";
   };
 
   propagatedBuildInputs = [ kdelibs subversion qt4 phonon ];
-  buildInputs = [ cmake automoc4 perl gettext pkgconfig apr aprutil boost stdenv.gcc.libc ];
+  buildInputs =
+    [ cmake automoc4 perl gettext pkgconfig apr aprutil boost
+      stdenv.gcc.libc qjson
+    ];
 
   meta = with stdenv.lib; {
     maintainers = [ maintainers.urkud ];