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The test for the if_pppox.h header file needs to also include linux/in6.h (ipv6 support). Fixes openwrt ticket #13321 Signed-off-by: Nils Rennebarth <nils.rennebarth@teldat.com> git-svn-id: svn://svn.openwrt.org/openwrt/packages@39516 3c298f89-4303-0410-b956-a3cf2f4a3e73