Why version of GTK+ are you using?
gtk_label_set_xalign() is available only since 3.16 https://developer.gnome.org/gtk3/stable/GtkLabel.html#gtk-label-set-xalign
Why version of GTK+ are you using?
gtk_label_ set_xalign( ) is available only since 3.16 https:/ /developer. gnome.org/ gtk3/stable/ GtkLabel. html#gtk- label-set- xalign