OpenBSD 7.9 Octeon release fails to compile without IPV6 - Kernel Compilation Bug - if_ogx.c

> Issue: Kernel does not compile if IPV6 support is disabled
>
> Steps to recreate: Install the 7.9 sys release source code on an 
> octeon system.
> Edit /usr/src/sys/conf/GENERIC and comment out "option INET6"
> Configure and compile as normal - will fail with the following error:
>
> cc  -g -Werror -Wall -Wimplicit-function-declaration 
> -Wno-pointer-sign  -Wframe-larger-than=2047 
> -Wno-address-of-packed-member -Wno-constant-conversion 
> -Wno-unused-but-set-variable -Wno-gnu-folding-constant -march=mips64r2 
> -mno-abicalls  -msoft-float -G 0 -ffreestanding -fomit-frame-pointer 
> -O2  -pipe -nostdinc -I/usr/sys 
> -I/usr/sys/arch/octeon/compile/EDGE.MP/obj -I/usr/sys/arch 
> -DDIAGNOSTIC -DKTRACE -DACCOUNTING -DKMEMSTATS -DPTRACE -DPOOL_DEBUG 
> -DCRYPTO -DSYSVMSG -DSYSVSEM -DSYSVSHM -DUVM_SWAP_ENCRYPT -DFFS -DFFS2 
> -DUFS_DIRHASH -DQUOTA -DEXT2FS -DMFS -DNFSCLIENT -DNFSSERVER -DCD9660 
> -DUDF -DMSDOSFS -DFIFO -DTMPFS -DFUSE -DSOCKET_SPLICE -DTCP_ECN 
> -DTCP_SIGNATURE -DIPSEC -DPPP_BSDCOMP -DPPP_DEFLATE -DPIPEX -DMROUTING 
> -DMPLS -DBOOT_CONFIG -DCPU_MIPS64R2 -DCPU_OCTEON -DFPUEMUL 
> -DMIPS_PTE64 -DPCIVERBOSE -DUSER_PCICONF -DUSBVERBOSE -DONEWIREVERBOSE 
> -DMULTIPROCESSOR -DMAXUSERS=32 -D_KERNEL -D__octeon__ -MD -MP -c 
> /usr/sys/arch/octeon/dev/if_ogx.c
> /usr/sys/arch/octeon/dev/if_ogx.c:1282:22: error: invalid application 
> of 'sizeof' to an incomplete type 'struct ip6_hdr'
>  1282 |                         hdr |= (ehdrlen + sizeof(struct 
> ip6_hdr)) <<
>       |                                           ^  ~~~~~~~~~~~~~~~~
> /usr/sys/netinet/if_ether.h:306:9: note: forward declaration of 
> 'struct ip6_hdr'
>   306 |         struct ip6_hdr                  *ip6;
>       |                ^
> 1 error generated.
> *** Error 1 in /usr/sys/arch/octeon/compile/EDGE.MP (Makefile:627 
> 'if_ogx.o')
> root@defender /usr/sys/arch/octeon/compile/EDGE.MP>
>
> Sincerely,
>
> Gabriel
>
>
>