Is present in at least OpenSSL 1.0.2 / master.
The code in bss_dgram.c checks if IP_MTUDISCOVER is defined, where it should
test for IP_MTU_DISCOVER:
diff --git a/crypto/bio/bss_dgram.c b/crypto/bio/bss_dgram.c
index 5eade50..7cd57bf 100644
--- a/crypto/bio/bss_dgram.c
+++ b/crypto/bio/bss_dgram.c
@@ -882,7 +882,7 @@ static long dgram_ctrl(BIO *b, int cmd, long num, void *ptr)
perror("setsockopt");
ret = -1;
}
-# elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTUDISCOVER)
+# elif defined(OPENSSL_SYS_LINUX) && defined(IP_MTU_DISCOVER)
if ((sockopt_val = num ? IP_PMTUDISC_PROBE : IP_PMTUDISC_DONT),
(ret = setsockopt(b->num, IPPROTO_IP, IP_MTU_DISCOVER,
&sockopt_val, sizeof(sockopt_val))) < 0) {
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