Header clash during build on Ubuntu 22.04

[billw1955]

Tried master and 63f0759

make[2]: Entering directory '/home/coreuser/Documents/ospf-mdr/zebra'
gcc -DHAVE_CONFIG_H -DSYSCONFDIR=\"/usr/local/etc/quagga/\" -DMULTIPATH_NUM=1 -I. -I.. -I.. -I.. -I../lib    -fPIE  -ggdb -MT test_main.o -MD -MP -MF .deps/test_main.Tpo -c -o test_main.o test_main.c
mv -f .deps/test_main.Tpo .deps/test_main.Po
gcc -DHAVE_CONFIG_H -DSYSCONFDIR=\"/usr/local/etc/quagga/\" -DMULTIPATH_NUM=1 -I. -I.. -I.. -I.. -I../lib    -fPIE  -ggdb -MT zebra_rib.o -MD -MP -MF .deps/zebra_rib.Tpo -c -o zebra_rib.o zebra_rib.c
mv -f .deps/zebra_rib.Tpo .deps/zebra_rib.Po
gcc -DHAVE_CONFIG_H -DSYSCONFDIR=\"/usr/local/etc/quagga/\" -DMULTIPATH_NUM=1 -I. -I.. -I.. -I.. -I../lib    -fPIE  -ggdb -MT interface.o -MD -MP -MF .deps/interface.Tpo -c -o interface.o interface.c
In file included from interface.c:37:
../zebra/rtadv.h:71:8: error: redefinition of ‘struct nd_opt_adv_interval’
   71 | struct nd_opt_adv_interval {   /* Advertisement interval option */
      |        ^~~~~~~~~~~~~~~~~~~
In file included from ../lib/zebra.h:211,
                 from interface.c:23:
/usr/include/netinet/icmp6.h:329:8: note: originally defined here
  329 | struct nd_opt_adv_interval
      |        ^~~~~~~~~~~~~~~~~~~
make[2]: *** [Makefile:609: interface.o] Error 1
make[2]: Leaving directory '/home/coreuser/Documents/ospf-mdr/zebra'
make[1]: *** [Makefile:481: all-recursive] Error 1
make[1]: Leaving directory '/home/coreuser/Documents/ospf-mdr'
make: *** [Makefile:413: all] Error 2

6.2.0-1015-aws #15~22.04.1-Ubuntu SMP Fri Oct  6 21:37:24 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux

PRETTY_NAME="Ubuntu 22.04.3 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.3 LTS (Jammy Jellyfish)"

||/ Name           Version            Architecture Description
+++-==============-==================-============-===============================================================
ii  autoconf       2.71-2             all          automatic configure script builder
ii  automake       1:1.16.5-1.3       all          Tool for generating GNU Standards-compliant Makefiles
ii  gawk           1:5.1.0-1ubuntu0.1 amd64        GNU awk, a pattern scanning and processing language
ii  libtool        2.4.6-15build2     all          Generic library support script
ii  make           4.3-4.1build1      amd64        utility for directing compilation
ii  texinfo        6.8-4build1        amd64        Documentation system for on-line information and printed output

*   acaf5c4 (HEAD -> master, origin/master, origin/HEAD) Merge pull request #6 from dpward/vtysh-extract-xpimd
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| * 640855d vtysh: Limit files in xpimd/ processed by extract.pl
* |   e7ab6a0 Merge pull request #5 from dpward/xpimd-static-assert
|\ \
| |/
|/|
| * 6dbc6ec xpimd: Rename macro static_assert() to x_static_assert()
|/
* 9d7bec5 packaging: Update rpm spec file to work on newer systems.
*   63f0759 Merge pull request #4 from hdznrrd/master
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| * 0a55487 Added extern
|/
* f21688c ospf6d: Update the next-best route before removing a route.
*