I try to build r84622 with --enable-directory-upload (Linux/GTK+ build) I get the following: Source/WebKit/gtk/webkit/webkitwebview.cpp: In function 'void webkit_web_view_init(WebKitWebView*)': Source/WebKit/gtk/webkit/webkitwebview.cpp:3496:64: error: cannot allocate an object of abstract type 'WebKit::ChromeClient' ./Source/WebKit/gtk/WebCoreSupport/ChromeClientGtk.h:37:55: note: because the following virtual functions are pure within 'WebKit::ChromeClient': ./Source/WebCore/page/ChromeClient.h:229:22: note: virtual void WebCore::ChromeClient::enumerateChosenDirectory(const WTF::String&, WebCore::FileChooser*) make[1]: *** [Source/WebKit/gtk/webkit/libwebkitgtk_1_0_la-webkitwebview.lo] Error 1 make[1]: Leaving directory `/tmp/nix-build-1gz5bjzq1wgg1bmy1im3h5k494wab18j-webkit-r84622.drv-0/WebKit-r84622'