The branch main has been updated by tuexen:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=224cf7b35b9bbe8d075f6004249d850c620b7855

commit 224cf7b35b9bbe8d075f6004249d850c620b7855
Author:     Michael Tuexen <tue...@freebsd.org>
AuthorDate: 2021-06-11 07:50:46 +0000
Commit:     Michael Tuexen <tue...@freebsd.org>
CommitDate: 2021-06-11 07:50:46 +0000

    tcp: fix compilation of IPv4-only builds
    
    PR:                     256538
    Reported by:            iron.ud...@gmail.com
    MFC after:              3 days
    Sponsored by:           Netflix, Inc.
---
 sys/netinet/tcp_stacks/rack.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/netinet/tcp_stacks/rack.c b/sys/netinet/tcp_stacks/rack.c
index 5227ea59ba23..6ce866b77450 100644
--- a/sys/netinet/tcp_stacks/rack.c
+++ b/sys/netinet/tcp_stacks/rack.c
@@ -17677,9 +17677,11 @@ send:
                th = rack->r_ctl.fsb.th;
                udp = rack->r_ctl.fsb.udp;
                if (udp) {
+#ifdef INET6
                        if (isipv6)
                                ulen = hdrlen + len - sizeof(struct ip6_hdr);
                        else
+#endif                         /* INET6 */
                                ulen = hdrlen + len - sizeof(struct ip);
                        udp->uh_ulen = htons(ulen);
                }
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