The glibc headers <netinet/in.h> failed to provide all IPv6 Advanced API (RFC3542) (1) defines. Some applications were unable to build because of the missing defines. The missing defines have now been added to the header and applications requiring IPV6_RECVPATHMTU, IPV6_PATHMTU, and IPV6_DONTFRAG can now build again.
sudo dnf upgrade --advisory=FEDORA-2015-11443
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