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'cp -u' is not specified in POSIX and it can fail with illegal option error on systems not supporting it. It is better to fallback to the slower 'cp' than causing build failure. https://bugzilla.gnome.org/show_bug.cgi?id=791784
76b68df1
'cp -u' is not specified in POSIX and it can fail with illegal option error on systems not supporting it. It is better to fallback to the slower 'cp' than causing build failure. https://bugzilla.gnome.org/show_bug.cgi?id=791784