diff --git a/pkgs/desktops/kde-4.10/kde-runtime.nix b/pkgs/desktops/kde-4.10/kde-runtime.nix
index 6b642eb0b22..b562d8cadd5 100644
--- a/pkgs/desktops/kde-4.10/kde-runtime.nix
+++ b/pkgs/desktops/kde-4.10/kde-runtime.nix
@@ -1,18 +1,20 @@
 { kde, kdelibs, shared_desktop_ontologies, bzip2, libssh, exiv2, attica
 , libcanberra, virtuoso, samba, libjpeg, ntrack, pkgconfig, qca2, xz, pulseaudio
-, networkmanager, kactivities, kdepimlibs
+, networkmanager, kactivities, kdepimlibs, openexr, ilmbase
 }:
 
 kde {
   buildInputs = [
     kdelibs attica xz bzip2 libssh libjpeg exiv2 ntrack
     qca2 samba (libcanberra.override { gtk = null; }) pulseaudio
-    networkmanager kactivities kdepimlibs
-#todo: add openslp, openexr
+    networkmanager kactivities kdepimlibs openexr
+#todo: add openslp
   ];
 
   nativeBuildInputs = [ pkgconfig ];
 
+  NIX_CFLAGS_COMPILE = "-I${ilmbase}/include/OpenEXR";
+
   passthru.propagatedUserEnvPackages = [ virtuoso ];
 
   meta = {