vtk: build with system libtiff

fixes vtktiff, therefore at least gdcm

pkgs/development/libraries/vtk/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, cmake, libGLU_combined, libX11, xorgproto, libXt
+{ stdenv, fetchurl, cmake, libGLU_combined, libX11, xorgproto, libXt, libtiff
 , qtLib ? null
 # Darwin support
 , Cocoa, CoreServices, DiskArbitration, IOKit, CFNetwork, Security, GLUT, OpenGL
@@ -20,7 +20,9 @@ stdenv.mkDerivation rec {
     sha256 = "0nm7xwwj7rnsxjdv2ssviys8nhci4n9iiiqm2y14s520hl2dsp1d";
   };
 
-  buildInputs = [ cmake ]
+  nativeBuildInputs = [ cmake ];
+
+  buildInputs = [ libtiff ]
     ++ optional (qtLib != null) qtLib
     ++ optionals stdenv.isLinux [ libGLU_combined libX11 xorgproto libXt ]
     ++ optionals stdenv.isDarwin [ xpc Cocoa CoreServices DiskArbitration IOKit
@@ -38,7 +40,7 @@ stdenv.mkDerivation rec {
   # built and requiring one of the shared objects.
   # At least, we use -fPIC for other packages to be able to use this in shared
   # objects.
-  cmakeFlags = [ "-DCMAKE_C_FLAGS=-fPIC" "-DCMAKE_CXX_FLAGS=-fPIC" ]
+  cmakeFlags = [ "-DCMAKE_C_FLAGS=-fPIC" "-DCMAKE_CXX_FLAGS=-fPIC" "-DVTK_USE_SYSTEM_TIFF=1" ]
     ++ optional (qtLib != null) [ "-DVTK_USE_QT:BOOL=ON" ]
     ++ optional stdenv.isDarwin "-DOPENGL_INCLUDE_DIR=${OpenGL}/Library/Frameworks";