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We need -D_GNU_SOURCE. However, that also introduces a "dprintf" prototype, which clashes with our local dprintf. We use an ugly workaround. (Don't want to touch every caller of dprintf, because the patch would be huge.) git-svn-id: svn://svn.openwrt.org/openwrt/packages@23802 3c298f89-4303-0410-b956-a3cf2f4a3e73