2 files changed, 4 insertions, 2 deletions
diff --git a/pkgs/applications/window-managers/fvwm/default.nix b/pkgs/applications/window-managers/fvwm/default.nix
index 7587dcb490ae..0b9c286aa9de 100644
--- a/pkgs/applications/window-managers/fvwm/default.nix
+++ b/pkgs/applications/window-managers/fvwm/default.nix
@@ -17,8 +17,9 @@ stdenv.mkDerivation rec {
     sha256 = "01654d5abdcde6dac131cae9befe5cf6f01f9f7524d097c3b0f316e39f84ef73";
   };
 
+  nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
-    pkgconfig cairo fontconfig freetype
+    cairo fontconfig freetype
     libXft libXcursor libXinerama libXpm libXt
     librsvg libpng fribidi perl
   ] ++ stdenv.lib.optional gestures libstroke;
diff --git a/pkgs/applications/window-managers/openbox/default.nix b/pkgs/applications/window-managers/openbox/default.nix
index 7b60d573d1e5..ead78bf4efd9 100644
--- a/pkgs/applications/window-managers/openbox/default.nix
+++ b/pkgs/applications/window-managers/openbox/default.nix
@@ -6,8 +6,9 @@ stdenv.mkDerivation rec {
   name = "openbox-${version}";
   version = "3.6.1";
 
+  nativeBuildInputs = [ pkgconfig ];
   buildInputs = [
-    pkgconfig libxml2
+    libxml2
     libXinerama libXcursor libXau libXrandr libICE libSM
     libstartup_notification makeWrapper
     python2.pkgs.wrapPython