navit: fix build

pkgs/applications/misc/navit/default.nix

···
     sha256 = "1xx62l5srfhh9cfi7n3pxj8hpcgr1rpa0hzfmbrqadzv09z36723";
   };
 
-  # 'cvs' is only for the autogen
-  buildInputs = [ pkgconfig gtk SDL fontconfig freetype imlib2 SDL_image mesa
-    libXmu freeglut python gettext quesoglc gd postgresql cmake qt4 SDL_ttf fribidi ];
+  buildInputs = [ gtk SDL fontconfig freetype imlib2 SDL_image mesa
+    libXmu freeglut python gettext quesoglc gd postgresql qt4 SDL_ttf fribidi ];
+
+  nativeBuildInputs = [ pkgconfig cmake ];
+
+  NIX_CFLAGS_COMPILE = [ "-I${SDL.dev}/include/SDL" ];
 
   cmakeFlags = [ "-DSAMPLE_MAP=n" ];