inkscape button_cancel.svg --export-width=16 --export-height=16 -e button-cancel.png

(process:30159): Gtk-CRITICAL **: file gtksettings.c: line 447 (gtk_settings_get_for_screen): assertion `GDK_IS_SCREEN (screen)' failed

(process:30159): GLib-GObject-CRITICAL **: file gobject.c: line 1222 (g_object_get): assertion `G_IS_OBJECT (object)' failed

(process:30159): GLib-GObject-WARNING **: value "TRUE" of type `gboolean' is invalid or out of range for property `visible' of type `gboolean'

(process:30159): GLib-GObject-CRITICAL **: file gobject.c: line 1620 (g_object_set_qdata_full): assertion `quark > 0' failed
inkscape: symbol lookup error: inkscape: undefined symbol: g_return_if_fail_warning