X-Git-Url: https://www.bearssl.org/gitweb//home/git/?p=BearSSL;a=blobdiff_plain;f=tools%2Fserver.c;h=cb047113a6811e9b522f0d22c208b7c2fe3d948b;hp=363028f0c0ae7f76b926b328c288513e7fb10c35;hb=4aac1cd5c65462d5ad13e377705a00eab8c80d81;hpb=5f045c759957fdff8c85716e6af99e10901fdac0;ds=sidebyside

diff --git a/tools/server.c b/tools/server.c
index 363028f..cb04711 100644
--- a/tools/server.c
+++ b/tools/server.c
@@ -119,9 +119,16 @@ host_bind(const char *host, const char *port, int verbose)
 		opt = 1;
 		setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
 			(void *)&opt, sizeof opt);
+#ifdef IPV6_V6ONLY
+		/*
+		 * We want to make sure that the server socket works for
+		 * both IPv4 and IPv6. But IPV6_V6ONLY is not defined on
+		 * some very old systems.
+		 */
 		opt = 0;
 		setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY,
 			(void *)&opt, sizeof opt);
+#endif
 		if (bind(fd, sa, sa_len) < 0) {
 			if (verbose) {
 				perror("bind()");