README: note min kernerl version for SO_BINDTOIFINDEX

Prompted by https://github.com/systemd/systemd/pull/36893

diff --git a/README b/README
index 0caf42b9d51f2576d14d99efe0e7d964c8dd74e4..88a516d632b0a9e66e4cc11a37f97c640b609c4f 100644 (file)
--- a/README
+++ b/README
@@ -42,6 +42,7 @@ REQUIREMENTS:
                      ≥ 4.17 for cgroup-bpf socket address hooks, /sys/power/resume_offset,
                             and FRA_PROTOCOL attribute for fib rules
                      ≥ 4.20 for PSI (used by systemd-oomd)
+                     ≥ 5.0 for SO_BINDTOIFINDEX
                      ≥ 5.2 for cgroup freezer and new mount API
                      ≥ 5.3 for bounded loops in BPF program, keyring namespacing,
                            and nexthop support