Hello,

I am currently trying to compile some programs (which are not yet available as ports) for SerenityOS, including a networking tool.
This shows an error message when compiling that the IPv6 header file is missing.

[...]
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_addr.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] In file included from scamper_ip6.c:29:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_icmp_resp.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_tcp4.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_tcp6.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] In file included from scamper_icmp4.c:31:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_icmpext_int.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] In file included from scamper_ip4.c:29:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper.c:34:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_osinfo.c:29:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_icmpext.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_icmp6.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] In file included from scamper_debug.c:31:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] make[2]: *** [Makefile:2205: scamper-scamper_tcp4.o] Error 1
[scamper/build] make[2]: *** Waiting for unfinished jobs....
[scamper/build] make[2]: *** [Makefile:2219: scamper-scamper_tcp6.o] Error 1
[scamper/build] In file included from scamper_udp4.c:30:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] make[2]: *** [Makefile:2163: scamper-scamper_icmp_resp.o] Error 1
[scamper/build] make[2]: *** [Makefile:2037: scamper-scamper.o] Error 1
[scamper/build] make[2]: *** [Makefile:2079: scamper-scamper_list.o] Error 1
[scamper/build] make[2]: *** [Makefile:2247: scamper-scamper_ip4.o] Error 1
[scamper/build] make[2]: *** [Makefile:2051: scamper-scamper_osinfo.o] Error 1
[scamper/build] make[2]: *** [Makefile:2135: scamper-scamper_icmp4.o] Error 1
[scamper/build] make[2]: *** [Makefile:2177: scamper-scamper_icmpext.o] Error 1
[scamper/build] make[2]: *** [Makefile:2191: scamper-scamper_icmpext_int.o] Error 1
[scamper/build] make[2]: *** [Makefile:2065: scamper-scamper_addr.o] Error 1
[scamper/build] make[2]: *** [Makefile:2149: scamper-scamper_icmp6.o] Error 1
[scamper/build] make[2]: *** [Makefile:2233: scamper-scamper_ip6.o] Error 1
[scamper/build] make[2]: *** [Makefile:2093: scamper-scamper_debug.o] Error 1
[scamper/build] make[2]: *** [Makefile:2107: scamper-scamper_udp4.o] Error 1
[scamper/build] In file included from scamper_udp6.c:29:
[scamper/build] ../internal.h:140:10: fatal error: netinet/ip6.h: No such file or directory
[scamper/build]   140 | #include <netinet/ip6.h>
[scamper/build]       |          ^~~~~~~~~~~~~~~
[scamper/build] compilation terminated.
[scamper/build] make[2]: *** [Makefile:2121: scamper-scamper_udp6.o] Error 1
[scamper/build] make[2]: Leaving directory '/home/marek/serenity/Build/x86_64/Ports/scamper/scamper-cvs-20240122/scamper'
[scamper/build] make[1]: *** [Makefile:436: all-recursive] Error 1
[scamper/build] make[1]: Leaving directory '/home/marek/serenity/Build/x86_64/Ports/scamper/scamper-cvs-20240122'
[scamper/build] make: *** [Makefile:368: all] Error 2

I then looked in https://github.com/SerenityOS/serenity/tree/master/Userland/Libraries/LibC/netinet myself and could not find the ip6.h either. Where is it in SerenityOS?