--- modules/ssl/ssl_engine_init.c.orig	2017-04-03 11:39:20 UTC
+++ modules/ssl/ssl_engine_init.c
@@ -47,7 +47,7 @@ APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl,
 #define KEYTYPES "RSA or DSA"
 #endif
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 /* OpenSSL Pre-1.1.0 compatibility */
 /* Taken from OpenSSL 1.1.0 snapshot 20160410 */
 static int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
@@ -380,7 +380,7 @@ apr_status_t ssl_init_Module(apr_pool_t 
     modssl_init_app_data2_idx(); /* for modssl_get_app_data2() at request time */
 
     init_dh_params();
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
     init_bio_methods();
 #endif
 
@@ -583,7 +583,7 @@ static apr_status_t ssl_init_ctx_protoco
 
     SSL_CTX_set_options(ctx, SSL_OP_ALL);
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
     /* always disable SSLv2, as per RFC 6176 */
     SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2);
 
@@ -2011,7 +2011,7 @@ apr_status_t ssl_init_ModuleKill(void *d
 
     }
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
     free_bio_methods();
 #endif
     free_dh_params();
--- modules/ssl/ssl_private.h.orig	2017-04-03 11:39:20 UTC
+++ modules/ssl/ssl_private.h
@@ -136,7 +136,7 @@
 #endif
 
 /* session id constness */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #define IDCONST
 #else
 #define IDCONST const
@@ -159,7 +159,7 @@
 #if !defined(OPENSSL_NO_OCSP) && defined(SSL_CTX_set_tlsext_status_cb)
 #define HAVE_OCSP_STAPLING
 /* All exist but are no longer macros since OpenSSL 1.1.0 */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 /* backward compatibility with OpenSSL < 1.0 */
 #ifndef sk_OPENSSL_STRING_num
 #define sk_OPENSSL_STRING_num sk_num
@@ -199,7 +199,7 @@
 
 #endif /* !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name) */
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #define BN_get_rfc2409_prime_768   get_rfc2409_prime_768
 #define BN_get_rfc2409_prime_1024  get_rfc2409_prime_1024
 #define BN_get_rfc3526_prime_1536  get_rfc3526_prime_1536
--- modules/ssl/ssl_util_ssl.h.orig	2017-03-20 12:01:16 UTC
+++ modules/ssl/ssl_util_ssl.h
@@ -41,7 +41,7 @@
 #define MODSSL_LIBRARY_VERSION OPENSSL_VERSION_NUMBER
 #define MODSSL_LIBRARY_NAME    "OpenSSL"
 #define MODSSL_LIBRARY_TEXT    OPENSSL_VERSION_TEXT
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #define MODSSL_LIBRARY_DYNTEXT SSLeay_version(SSLEAY_VERSION)
 #else
 #define MODSSL_LIBRARY_DYNTEXT OpenSSL_version(OPENSSL_VERSION)
--- support/ab.c.orig	2017-05-28 21:15:41 UTC
+++ support/ab.c
@@ -2514,7 +2514,7 @@ int main(int argc, const char * const ar
         exit(1);
     }
     SSL_CTX_set_options(ssl_ctx, SSL_OP_ALL);
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
     SSL_CTX_set_max_proto_version(ssl_ctx, max_prot);
     SSL_CTX_set_min_proto_version(ssl_ctx, min_prot);
 #endif