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Commonly distributed binutils (e.g., Debian) comes built with --enable-deterministic-archives which makes ar default to option "D". Option "D" overrides "u" and if "u" is given a cautionary message will be printed. Autoconf seems to set options "cru" by default. Avoid the annoying message by removing "u", and, for completeness, explicitly put "D" as well. https://bugzilla.gnome.org/show_bug.cgi?id=785763
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