--- httpd-2.4.26/modules/ssl/mod_ssl.c
+++ httpd-2.4.26.libressl/modules/ssl/mod_ssl.c
@@ -337,12 +337,12 @@
 #if HAVE_ENGINE_LOAD_BUILTIN_ENGINES
     ENGINE_cleanup();
 #endif
-#if OPENSSL_VERSION_NUMBER >= 0x1000200fL
+#if OPENSSL_VERSION_NUMBER >= 0x1000200fL && !defined(OPENSSL_NO_COMP)
     SSL_COMP_free_compression_methods();
 #endif
 
     /* Usually needed per thread, but this parent process is single-threaded */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #if OPENSSL_VERSION_NUMBER >= 0x1000000fL
     ERR_remove_thread_state(NULL);
 #else
@@ -383,14 +383,14 @@
     /* Some OpenSSL internals are allocated per-thread, make sure they
      * are associated to the/our same thread-id until cleaned up.
      */
-#if APR_HAS_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
+#if APR_HAS_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
     ssl_util_thread_id_setup(pconf);
 #endif
 
     /* We must register the library in full, to ensure our configuration
      * code can successfully test the SSL environment.
      */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
     CRYPTO_malloc_init();
 #else
     OPENSSL_malloc_init();
--- httpd-2.4.26/modules/ssl/ssl_engine_init.c
+++ httpd-2.4.26.libressl/modules/ssl/ssl_engine_init.c
@@ -47,7 +47,7 @@
 #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)
@@ -257,7 +257,7 @@
 #endif
     }
 
-#if APR_HAS_THREADS && OPENSSL_VERSION_NUMBER < 0x10100000L
+#if APR_HAS_THREADS && ( OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER) )
     ssl_util_thread_setup(p);
 #endif
 
@@ -380,7 +380,7 @@
     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
 
@@ -1301,7 +1301,7 @@
      * or configure NIST P-256 (required to enable ECDHE for earlier versions)
      * ECDH is always enabled in 1.1.0 unless excluded from SSLCipherList
      */
-#if (OPENSSL_VERSION_NUMBER < 0x10100000L)
+#if (OPENSSL_VERSION_NUMBER < 0x10100000L) || defined(LIBRESSL_VERSION_NUMBER)
     else {
 #if defined(SSL_CTX_set_ecdh_auto)
         SSL_CTX_set_ecdh_auto(mctx->ssl_ctx, 1);
@@ -2011,7 +2011,7 @@
 
     }
 
-#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L && !defined(LIBRESSL_VERSION_NUMBER)
     free_bio_methods();
 #endif
     free_dh_params();
--- httpd-2.4.26/modules/ssl/ssl_engine_io.c
+++ httpd-2.4.26.libressl/modules/ssl/ssl_engine_io.c
@@ -164,7 +164,7 @@
 {
     BIO_set_shutdown(bio, 1);
     BIO_set_init(bio, 1);
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
     /* No setter method for OpenSSL 1.1.0 available,
      * but I can't find any functional use of the
      * "num" field there either.
@@ -549,7 +549,7 @@
     return -1;
 }
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
         
 static BIO_METHOD bio_filter_out_method = {
     BIO_TYPE_MEM,
@@ -2024,7 +2024,7 @@
 
     filter_ctx->pInputFilter = ap_add_input_filter(ssl_io_filter, inctx, r, c);
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
     filter_ctx->pbioRead = BIO_new(&bio_filter_in_method);
 #else
     filter_ctx->pbioRead = BIO_new(bio_filter_in_method);
@@ -2059,7 +2059,7 @@
     filter_ctx->pOutputFilter   = ap_add_output_filter(ssl_io_filter,
                                                        filter_ctx, r, c);
 
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
     filter_ctx->pbioWrite       = BIO_new(&bio_filter_out_method);
 #else
     filter_ctx->pbioWrite       = BIO_new(bio_filter_out_method);
--- httpd-2.4.26/modules/ssl/ssl_engine_kernel.c
+++ httpd-2.4.26.libressl/modules/ssl/ssl_engine_kernel.c
@@ -1733,7 +1733,7 @@
  * so we need to increment here to prevent them from
  * being freed.
  */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #define modssl_set_cert_info(info, cert, pkey) \
     *cert = info->x509; \
     CRYPTO_add(&(*cert)->references, +1, CRYPTO_LOCK_X509); \
--- httpd-2.4.26/modules/ssl/ssl_engine_vars.c
+++ httpd-2.4.26.libressl/modules/ssl/ssl_engine_vars.c
@@ -529,7 +529,7 @@
         resdup = FALSE;
     }
     else if (strcEQ(var, "A_SIG")) {
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
         nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->signature->algorithm));
 #else
         const ASN1_OBJECT *paobj;
--- httpd-2.4.26/modules/ssl/ssl_private.h
+++ httpd-2.4.26.libressl/modules/ssl/ssl_private.h
@@ -123,6 +123,16 @@
 #define MODSSL_SSL_METHOD_CONST
 #endif
 
+#if defined(LIBRESSL_VERSION_NUMBER)
+/* Missing from LibreSSL */
+#define SSL_CTRL_SET_MIN_PROTO_VERSION          123
+#define SSL_CTRL_SET_MAX_PROTO_VERSION          124
+#define SSL_CTX_set_min_proto_version(ctx, version) \
+        SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
+#define SSL_CTX_set_max_proto_version(ctx, version) \
+        SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
+#endif
+
 #if defined(OPENSSL_FIPS)
 #define HAVE_FIPS
 #endif
@@ -136,7 +146,7 @@
 #endif
 
 /* session id constness */
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 #define IDCONST
 #else
 #define IDCONST const
@@ -199,7 +209,7 @@
 
 #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
@@ -219,7 +229,7 @@
 void free_bio_methods(void);
 #endif
 
-#if OPENSSL_VERSION_NUMBER < 0x10002000L
+#if OPENSSL_VERSION_NUMBER < 0x10002000L || defined(LIBRESSL_VERSION_NUMBER)
 #define X509_STORE_CTX_get0_store(x) (x->ctx)
 #endif
 
@@ -934,7 +944,7 @@
                                  const char * const *);
 BOOL         ssl_util_path_check(ssl_pathcheck_t, const char *, apr_pool_t *);
 #if APR_HAS_THREADS
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 void         ssl_util_thread_setup(apr_pool_t *);
 #endif
 void         ssl_util_thread_id_setup(apr_pool_t *);
--- httpd-2.4.26/modules/ssl/ssl_util.c
+++ httpd-2.4.26.libressl/modules/ssl/ssl_util.c
@@ -247,7 +247,7 @@
 }
 
 #if APR_HAS_THREADS
-#if OPENSSL_VERSION_NUMBER < 0x10100000L
+#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
 /*
  * To ensure thread-safetyness in OpenSSL - work in progress
  */
--- httpd-2.4.26/modules/ssl/ssl_util_ssl.h
+++ httpd-2.4.26.libressl/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)
--- httpd-2.4.26/support/ab.c
+++ httpd-2.4.26.libressl/support/ab.c
@@ -197,6 +197,14 @@
 #if !defined(OPENSSL_NO_TLSEXT) && defined(SSL_set_tlsext_host_name)
 #define HAVE_TLSEXT
 #endif
+#if defined(LIBRESSL_VERSION_NUMBER) && LIBRESSL_VERSION_NUMBER < 0x2060000f
+# define SSL_CTRL_SET_MIN_PROTO_VERSION	123
+# define SSL_CTRL_SET_MAX_PROTO_VERSION 124
+#define SSL_CTX_set_min_proto_version(ctx, version) \
+   SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MIN_PROTO_VERSION, version, NULL)
+#define SSL_CTX_set_max_proto_version(ctx, version) \
+   SSL_CTX_ctrl(ctx, SSL_CTRL_SET_MAX_PROTO_VERSION, version, NULL)
+#endif
 #endif
 
 #include <math.h>