$OpenBSD: patch-src_common_h,v 1.1 2016/11/09 23:14:31 gsoares Exp $
--- a/src/common.h.orig	Mon Jun 27 04:29:32 2016
+++ b/src/common.h	Thu Nov  3 23:57:29 2016
@@ -448,7 +448,7 @@ extern char *sys_errlist[];
 #define OPENSSL_NO_TLS1_2
 #endif /* OpenSSL older than 1.0.1 || defined(OPENSSL_NO_TLS1) */
 
-#if OPENSSL_VERSION_NUMBER>=0x10100000L
+#if OPENSSL_VERSION_NUMBER>=0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
 #ifndef OPENSSL_NO_SSL2
 #define OPENSSL_NO_SSL2
 #endif /* !defined(OPENSSL_NO_SSL2) */
@@ -474,7 +474,7 @@ extern char *sys_errlist[];
 #include <openssl/des.h>
 #ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
-#if OPENSSL_VERSION_NUMBER<0x10100000L
+#if OPENSSL_VERSION_NUMBER<0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
 #endif /* OpenSSL older than 1.1.0 */
 #endif /* !defined(OPENSSL_NO_DH) */
$OpenBSD: patch-src_ctx_c,v 1.5 2017/09/12 16:15:24 gsoares Exp $
Index: src/ctx.c
--- a/src/ctx.c.orig
+++ b/src/ctx.c
@@ -295,7 +295,7 @@ NOEXPORT int matches_wildcard(char *servername, char *
 
 #ifndef OPENSSL_NO_DH
 
-#if OPENSSL_VERSION_NUMBER<0x10100000L
+#if OPENSSL_VERSION_NUMBER<0x10100000L || defined(LIBRESSL_VERSION_NUMBER) 
 NOEXPORT STACK_OF(SSL_CIPHER) *SSL_CTX_get_ciphers(const SSL_CTX *ctx) {
     return ctx->cipher_list;
 }
@@ -398,7 +398,7 @@ NOEXPORT int ecdh_init(SERVICE_OPTIONS *section) {
 /**************************************** initialize OpenSSL CONF */
 
 NOEXPORT int conf_init(SERVICE_OPTIONS *section) {
-#if OPENSSL_VERSION_NUMBER>=0x10002000L
+#if OPENSSL_VERSION_NUMBER>=0x10002000L && !defined(LIBRESSL_VERSION_NUMBER)
     SSL_CONF_CTX *cctx;
     NAME_LIST *curr;
     char *cmd, *param;
$OpenBSD: patch-src_ssl_c,v 1.6 2017/09/12 16:15:24 gsoares Exp $
Index: src/ssl.c
--- a/src/ssl.c.orig
+++ b/src/ssl.c
@@ -51,7 +51,7 @@ int index_ssl_cli, index_ssl_ctx_opt;
 int index_session_authenticated, index_session_connect_address;
 
 int ssl_init(void) { /* init TLS before parsing configuration file */
-#if OPENSSL_VERSION_NUMBER>=0x10100000L
+#if OPENSSL_VERSION_NUMBER>=0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
     OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS |
         OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
 #else
@@ -86,7 +86,7 @@ int ssl_init(void) { /* init TLS before parsing config
 }
 
 #ifndef OPENSSL_NO_DH
-#if OPENSSL_VERSION_NUMBER<0x10100000L
+#if OPENSSL_VERSION_NUMBER<0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 /* this is needed for dhparam.c generated with OpenSSL >= 1.1.0
  * to be linked against the older versions */
 int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) {
$OpenBSD: patch-src_sthreads_c,v 1.3 2017/09/12 16:15:24 gsoares Exp $
Index: src/sthreads.c
--- a/src/sthreads.c.orig
+++ b/src/sthreads.c
@@ -216,7 +216,7 @@ void stunnel_rwlock_destroy_debug(struct CRYPTO_dynloc
 
 struct CRYPTO_dynlock_value stunnel_locks[STUNNEL_LOCKS];
 
-#if OPENSSL_VERSION_NUMBER<0x10100004L
+#if OPENSSL_VERSION_NUMBER<0x10100004L || defined(LIBRESSL_VERSION_NUMBER)
 #define CRYPTO_THREAD_lock_new() CRYPTO_get_new_dynlockid()
 #endif
 
$OpenBSD: patch-src_verify_c,v 1.6 2017/09/12 16:15:24 gsoares Exp $
Index: src/verify.c
--- a/src/verify.c.orig
+++ b/src/verify.c
@@ -353,7 +353,7 @@ NOEXPORT int cert_check_local(X509_STORE_CTX *callback
     cert=X509_STORE_CTX_get_current_cert(callback_ctx);
     subject=X509_get_subject_name(cert);
 
-#if OPENSSL_VERSION_NUMBER<0x10100006L
+#if OPENSSL_VERSION_NUMBER<0x10100006L || defined(LIBRESSL_VERSION_NUMBER)
 #define X509_STORE_CTX_get1_certs X509_STORE_get1_certs
 #endif
     /* modern API allows retrieving multiple matching certificates */