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datadir is defined in terms of datarootdir by default in configure (datadir='${datarootdir}' with ${datarootdir} not expanded), so defining datadir must happen *after* datarootdir is defined in the glib-gettextize shell script. Otherwise ${datarootdir} is null when it is expanded at runtime. https://bugzilla.gnome.org/show_bug.cgi?id=518309
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