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-rw-r--r--src/backend/libpq/pqcomm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/libpq/pqcomm.c b/src/backend/libpq/pqcomm.c
index 14662e501f3..db79ca8eed3 100644
--- a/src/backend/libpq/pqcomm.c
+++ b/src/backend/libpq/pqcomm.c
@@ -361,7 +361,7 @@ StreamServerPort(int family, char *hostName, unsigned short portNumber,
}
#endif
-#ifdef IPV6_V6ONLY
+#if defined(IPV6_V6ONLY) && defined(IPPROTO_IPV6)
if (addr->ai_family == AF_INET6)
{
if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,