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This is the definitive solution to avoid build issues on old Linux
systems, where the system kernel headers might not contain some constants
or macros used by FRR (e.g. MPLS_IPTUNNEL_DST, introduced on 2015).
This is the same strategy adopted by other projects, like iproute2,
libnl, lldpd, strongswan, etc. These header files don't need to be in
sync with upstream, they only need to be updated when necessary (e.g. if
we want to use a new feature introduced by a recent kernel).
Fixes #962 using the solution suggested by David Lamparter.
Signed-off-by: Renato Westphal <renato@opensourcerouting.org>
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