diff --git a/src/network/ssl/qdtls_openssl.cpp b/src/network/ssl/qdtls_openssl.cpp
index 25a6c5f4..b688e9e2 100644
--- a/src/network/ssl/qdtls_openssl.cpp
+++ b/src/network/ssl/qdtls_openssl.cpp
@@ -713,7 +713,11 @@ bool DtlsState::initCtxAndConnection(QDtlsBasePrivate *dtlsBase)
 
     if (dtlsBase->mode == QSslSocket::SslServerMode) {
         if (dtlsBase->dtlsConfiguration.dtlsCookieEnabled)
+#ifndef LIBRESSL_VERSION_NUMBER
             q_SSL_set_options(newConnection.data(), SSL_OP_COOKIE_EXCHANGE);
+#else
+            q_SSL_ctrl(newConnection.data(), SSL_CTRL_OPTIONS, SSL_OP_COOKIE_EXCHANGE, NULL);
+#endif
         q_SSL_set_psk_server_callback(newConnection.data(), dtlscallbacks::q_PSK_server_callback);
     } else {
         q_SSL_set_psk_client_callback(newConnection.data(), dtlscallbacks::q_PSK_client_callback);
@@ -786,7 +790,11 @@ void DtlsState::setLinkMtu(QDtlsBasePrivate *dtlsBase)
     }
 
     // For now, we disable this option.
+#ifndef LIBRESSL_VERSION_NUMBER
     q_SSL_set_options(tlsConnection.data(), SSL_OP_NO_QUERY_MTU);
+#else
+    q_SSL_ctrl(tlsConnection.data(), SSL_CTRL_OPTIONS, SSL_OP_NO_QUERY_MTU, NULL);
+#endif
 
     q_DTLS_set_link_mtu(tlsConnection.data(), mtu);
 }
diff --git a/src/network/ssl/qsslcertificate_openssl.cpp b/src/network/ssl/qsslcertificate_openssl.cpp
index ca9d61cc..19774432 100644
--- a/src/network/ssl/qsslcertificate_openssl.cpp
+++ b/src/network/ssl/qsslcertificate_openssl.cpp
@@ -661,7 +661,7 @@ static QMultiMap<QByteArray, QString> _q_mapFromX509Name(X509_NAME *name)
         unsigned char *data = nullptr;
         int size = q_ASN1_STRING_to_UTF8(&data, q_X509_NAME_ENTRY_get_data(e));
         info.insert(name, QString::fromUtf8((char*)data, size));
-#if QT_CONFIG(opensslv11)
+#if QT_CONFIG(opensslv11) && !defined(LIBRESSL_VERSION_NUMBER)
         q_CRYPTO_free(data, nullptr, 0);
 #else
         q_CRYPTO_free(data);
diff --git a/src/network/ssl/qsslcontext_openssl.cpp b/src/network/ssl/qsslcontext_openssl.cpp
index c9f202f5..714add6b 100644
--- a/src/network/ssl/qsslcontext_openssl.cpp
+++ b/src/network/ssl/qsslcontext_openssl.cpp
@@ -351,9 +351,11 @@ init_context:
         return;
     }
 
+#ifndef LIBRESSL_VERSION_NUMBER
     // A nasty hacked OpenSSL using a level that will make our auto-tests fail:
     if (q_SSL_CTX_get_security_level(sslContext->ctx) > 1 && *forceSecurityLevel())
         q_SSL_CTX_set_security_level(sslContext->ctx, 1);
+#endif
 
     const long anyVersion =
 #if QT_CONFIG(dtls)
@@ -408,16 +410,28 @@ init_context:
         maxVersion = DTLS1_VERSION;
         break;
     case QSsl::DtlsV1_0OrLater:
+#ifdef DTLS_MAX_VERSION
         minVersion = DTLS1_VERSION;
         maxVersion = DTLS_MAX_VERSION;
+#else
+        Q_UNREACHABLE();
+#endif // DTLS_MAX_VERSION
         break;
     case QSsl::DtlsV1_2:
+#ifdef DTLS1_2_VERSION
         minVersion = DTLS1_2_VERSION;
         maxVersion = DTLS1_2_VERSION;
+#else
+        Q_UNREACHABLE();
+#endif // DTLS1_2_VERSION
         break;
     case QSsl::DtlsV1_2OrLater:
+#if defined(DTLS1_2_VERSION) && defined(DTLS_MAX_VERSION)
         minVersion = DTLS1_2_VERSION;
         maxVersion = DTLS_MAX_VERSION;
+#else
+        Q_UNREACHABLE();
+#endif // DTLS1_2_VERSION && DTLS_MAX_VERSION
         break;
     case QSsl::TlsV1_3OrLater:
 #ifdef TLS1_3_VERSION
@@ -456,7 +470,11 @@ init_context:
 
     // Enable bug workarounds.
     long options = QSslSocketBackendPrivate::setupOpenSslOptions(configuration.protocol(), configuration.d->sslOptions);
+#ifndef LIBRESSL_VERSION_NUMBER
     q_SSL_CTX_set_options(sslContext->ctx, options);
+#else
+    q_SSL_CTX_ctrl(sslContext->ctx, SSL_CTRL_OPTIONS, options, NULL);
+#endif
 
     // Tell OpenSSL to release memory early
     // http://www.openssl.org/docs/ssl/SSL_CTX_set_mode.html
@@ -722,6 +740,7 @@ void QSslContext::applyBackendConfig(QSslContext *sslContext)
     }
 #endif // ocsp
 
+#ifndef LIBRESSL_VERSION_NUMBER
     QSharedPointer<SSL_CONF_CTX> cctx(q_SSL_CONF_CTX_new(), &q_SSL_CONF_CTX_free);
     if (cctx) {
         q_SSL_CONF_CTX_set_ssl_ctx(cctx.data(), sslContext->ctx);
@@ -768,7 +787,9 @@ void QSslContext::applyBackendConfig(QSslContext *sslContext)
             sslContext->errorStr = msgErrorSettingBackendConfig(QSslSocket::tr("SSL_CONF_finish() failed"));
             sslContext->errorCode = QSslError::UnspecifiedError;
         }
-    } else {
+    } else
+#endif // LIBRESSL_VERSION_NUMBER
+    {
         sslContext->errorStr = msgErrorSettingBackendConfig(QSslSocket::tr("SSL_CONF_CTX_new() failed"));
         sslContext->errorCode = QSslError::UnspecifiedError;
     }
diff --git a/src/network/ssl/qsslcontext_openssl_p.h b/src/network/ssl/qsslcontext_openssl_p.h
index 70cb97aa..01a61cf5 100644
--- a/src/network/ssl/qsslcontext_openssl_p.h
+++ b/src/network/ssl/qsslcontext_openssl_p.h
@@ -61,6 +61,13 @@
 
 QT_BEGIN_NAMESPACE
 
+#ifndef DTLS_ANY_VERSION
+#define DTLS_ANY_VERSION 0x1FFFF
+#endif
+#ifndef TLS_ANY_VERSION
+#define TLS_ANY_VERSION 0x10000
+#endif
+
 #ifndef QT_NO_SSL
 
 class QSslContextPrivate;
diff --git a/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp b/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp
index aaf87411..a33ebc63 100644
--- a/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp
+++ b/src/network/ssl/qssldiffiehellmanparameters_openssl.cpp
@@ -141,7 +141,11 @@ static bool isSafeDH(DH *dh)
     const BIGNUM *g = nullptr;
     q_DH_get0_pqg(dh, &p, &q, &g);
 
+#ifndef LIBRESSL_VERSION_NUMBER
     if (q_BN_is_word(const_cast<BIGNUM *>(g), DH_GENERATOR_2)) {
+#else
+    if (BN_is_word(const_cast<BIGNUM *>(g), DH_GENERATOR_2)) {
+#endif
         const unsigned long residue = q_BN_mod_word(p, 24);
         if (residue == 11 || residue == 23)
             status &= ~DH_NOT_SUITABLE_GENERATOR;
diff --git a/src/network/ssl/qsslkey_openssl.cpp b/src/network/ssl/qsslkey_openssl.cpp
index 43cb8c6d..a27336aa 100644
--- a/src/network/ssl/qsslkey_openssl.cpp
+++ b/src/network/ssl/qsslkey_openssl.cpp
@@ -360,7 +360,7 @@ static QByteArray doCrypt(QSslKeyPrivate::Cipher cipher, const QByteArray &data,
     q_EVP_CipherUpdate(ctx,
         reinterpret_cast<unsigned char *>(output.data()), &len,
         reinterpret_cast<const unsigned char *>(data.constData()), data.size());
-    q_EVP_CipherFinal(ctx,
+    q_EVP_CipherFinal_ex(ctx,
         reinterpret_cast<unsigned char *>(output.data()) + len, &i);
     len += i;
 
diff --git a/src/network/ssl/qsslsocket_openssl.cpp b/src/network/ssl/qsslsocket_openssl.cpp
index 277037e5..026c69a4 100644
--- a/src/network/ssl/qsslsocket_openssl.cpp
+++ b/src/network/ssl/qsslsocket_openssl.cpp
@@ -653,7 +653,7 @@ bool QSslSocketBackendPrivate::initSslContext()
     else if (mode == QSslSocket::SslServerMode)
         q_SSL_set_psk_server_callback(ssl, &q_ssl_psk_server_callback);
 
-#if OPENSSL_VERSION_NUMBER >= 0x10101006L
+#if OPENSSL_VERSION_NUMBER >= 0x10101006L && !defined(LIBRESSL_VERSION_NUMBER)
     // Set the client callback for TLSv1.3 PSK
     if (mode == QSslSocket::SslClientMode
         && QSslSocket::sslLibraryBuildVersionNumber() >= 0x10101006L) {
@@ -704,7 +704,11 @@ bool QSslSocketBackendPrivate::initSslContext()
 void QSslSocketBackendPrivate::destroySslContext()
 {
     if (ssl) {
+#ifndef LIBRESSL_VERSION_NUMBER
         if (!q_SSL_in_init(ssl) && !systemOrSslErrorDetected) {
+#else
+        if (!SSL_in_init(ssl) && !systemOrSslErrorDetected) {
+#endif
             // We do not send a shutdown alert here. Just mark the session as
             // resumable for qhttpnetworkconnection's "optimization", otherwise
             // OpenSSL won't start a session resumption.
@@ -1841,7 +1845,11 @@ bool QSslSocketBackendPrivate::checkOcspStatus()
 void QSslSocketBackendPrivate::disconnectFromHost()
 {
     if (ssl) {
+#ifndef LIBRESSL_VERSION_NUMBER
         if (!shutdown && !q_SSL_in_init(ssl) && !systemOrSslErrorDetected) {
+#else
+        if (!shutdown && !SSL_in_init(ssl) && !systemOrSslErrorDetected) {
+#endif
             if (q_SSL_shutdown(ssl) != 1) {
                 // Some error may be queued, clear it.
                 const auto errors = getErrorsFromOpenSsl();
@@ -1910,7 +1918,11 @@ void QSslSocketBackendPrivate::continueHandshake()
     if (readBufferMaxSize)
         plainSocket->setReadBufferSize(readBufferMaxSize);
 
+#ifndef LIBRESSL_VERSION_NUMBER
     if (q_SSL_session_reused(ssl))
+#else
+    if (q_SSL_ctrl(ssl, SSL_CTRL_GET_SESSION_REUSED, 0, NULL))
+#endif
         configuration.peerSessionShared = true;
 
 #ifdef QT_DECRYPT_SSL_TRAFFIC
diff --git a/src/network/ssl/qsslsocket_openssl_symbols.cpp b/src/network/ssl/qsslsocket_openssl_symbols.cpp
index ed80fc14..5003db41 100644
--- a/src/network/ssl/qsslsocket_openssl_symbols.cpp
+++ b/src/network/ssl/qsslsocket_openssl_symbols.cpp
@@ -142,14 +142,19 @@ DEFINEFUNC2(int, OPENSSL_init_ssl, uint64_t opts, opts, const OPENSSL_INIT_SETTI
 DEFINEFUNC2(int, OPENSSL_init_crypto, uint64_t opts, opts, const OPENSSL_INIT_SETTINGS *settings, settings, return 0, return)
 DEFINEFUNC(BIO *, BIO_new, const BIO_METHOD *a, a, return nullptr, return)
 DEFINEFUNC(const BIO_METHOD *, BIO_s_mem, void, DUMMYARG, return nullptr, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC2(int, BN_is_word, BIGNUM *a, a, BN_ULONG w, w, return 0, return)
+#endif
 DEFINEFUNC(int, EVP_CIPHER_CTX_reset, EVP_CIPHER_CTX *c, c, return 0, return)
 DEFINEFUNC(int, EVP_PKEY_up_ref, EVP_PKEY *a, a, return 0, return)
 DEFINEFUNC2(EVP_PKEY_CTX *, EVP_PKEY_CTX_new, EVP_PKEY *pkey, pkey, ENGINE *e, e, return nullptr, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC(int, EVP_PKEY_param_check, EVP_PKEY_CTX *ctx, ctx, return 0, return)
+#endif
 DEFINEFUNC(void, EVP_PKEY_CTX_free, EVP_PKEY_CTX *ctx, ctx, return, return)
 DEFINEFUNC(int, EVP_PKEY_base_id, EVP_PKEY *a, a, return NID_undef, return)
 DEFINEFUNC(int, RSA_bits, RSA *a, a, return 0, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC(int, DSA_bits, DSA *a, a, return 0, return)
 DEFINEFUNC(int, OPENSSL_sk_num, OPENSSL_STACK *a, a, return -1, return)
 DEFINEFUNC2(void, OPENSSL_sk_pop_free, OPENSSL_STACK *a, a, void (*b)(void*), b, return, DUMMYARG)
@@ -157,10 +162,20 @@ DEFINEFUNC(OPENSSL_STACK *, OPENSSL_sk_new_null, DUMMYARG, DUMMYARG, return null
 DEFINEFUNC2(void, OPENSSL_sk_push, OPENSSL_STACK *a, a, void *b, b, return, DUMMYARG)
 DEFINEFUNC(void, OPENSSL_sk_free, OPENSSL_STACK *a, a, return, DUMMYARG)
 DEFINEFUNC2(void *, OPENSSL_sk_value, OPENSSL_STACK *a, a, int b, b, return nullptr, return)
+#else
+DEFINEFUNC(int, sk_num, STACK *a, a, return -1, return)
+DEFINEFUNC2(void, sk_pop_free, STACK *a, a, void (*b)(void*), b, return, DUMMYARG)
+DEFINEFUNC(_STACK *, sk_new_null, DUMMYARG, DUMMYARG, return nullptr, return)
+DEFINEFUNC2(void, sk_push, _STACK *a, a, void *b, b, return, DUMMYARG)
+DEFINEFUNC(void, sk_free, _STACK *a, a, return, DUMMYARG)
+DEFINEFUNC2(void *, sk_value, STACK *a, a, int b, b, return nullptr, return)
+#endif // LIBRESSL_VERSION_NUMBER
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC(int, SSL_session_reused, SSL *a, a, return 0, return)
 DEFINEFUNC2(unsigned long, SSL_CTX_set_options, SSL_CTX *ctx, ctx, unsigned long op, op, return 0, return)
 DEFINEFUNC(int, SSL_CTX_get_security_level, const SSL_CTX *ctx, ctx, return -1, return)
 DEFINEFUNC2(void, SSL_CTX_set_security_level, SSL_CTX *ctx, ctx, int level, level, return, return)
+#endif
 #ifdef TLS1_3_VERSION
 DEFINEFUNC2(int, SSL_CTX_set_ciphersuites, SSL_CTX *ctx, ctx, const char *str, str, return 0, return)
 DEFINEFUNC2(void, SSL_set_psk_use_session_callback, SSL *ssl, ssl, q_SSL_psk_use_session_cb_func_t callback, callback, return, DUMMYARG)
@@ -170,7 +185,9 @@ DEFINEFUNC(int, SSL_SESSION_is_resumable, const SSL_SESSION *s, s, return 0, ret
 DEFINEFUNC3(size_t, SSL_get_client_random, SSL *a, a, unsigned char *out, out, size_t outlen, outlen, return 0, return)
 DEFINEFUNC3(size_t, SSL_SESSION_get_master_key, const SSL_SESSION *ses, ses, unsigned char *out, out, size_t outlen, outlen, return 0, return)
 DEFINEFUNC6(int, CRYPTO_get_ex_new_index, int class_index, class_index, long argl, argl, void *argp, argp, CRYPTO_EX_new *new_func, new_func, CRYPTO_EX_dup *dup_func, dup_func, CRYPTO_EX_free *free_func, free_func, return -1, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC2(unsigned long, SSL_set_options, SSL *ssl, ssl, unsigned long op, op, return 0, return)
+#endif
 
 DEFINEFUNC(const SSL_METHOD *, TLS_method, DUMMYARG, DUMMYARG, return nullptr, return)
 DEFINEFUNC(const SSL_METHOD *, TLS_client_method, DUMMYARG, DUMMYARG, return nullptr, return)
@@ -184,7 +201,11 @@ DEFINEFUNC2(void, X509_STORE_set_verify_cb, X509_STORE *a, a, X509_STORE_CTX_ver
 DEFINEFUNC3(int, X509_STORE_set_ex_data, X509_STORE *a, a, int idx, idx, void *data, data, return 0, return)
 DEFINEFUNC2(void *, X509_STORE_get_ex_data, X509_STORE *r, r, int idx, idx, return nullptr, return)
 DEFINEFUNC(STACK_OF(X509) *, X509_STORE_CTX_get0_chain, X509_STORE_CTX *a, a, return nullptr, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC3(void, CRYPTO_free, void *str, str, const char *file, file, int line, line, return, DUMMYARG)
+#else
+DEFINEFUNC(void, CRYPTO_free, void *a, a, return, DUMMYARG)
+#endif
 DEFINEFUNC(long, OpenSSL_version_num, void, DUMMYARG, return 0, return)
 DEFINEFUNC(const char *, OpenSSL_version, int a, a, return nullptr, return)
 DEFINEFUNC(unsigned long, SSL_SESSION_get_ticket_lifetime_hint, const SSL_SESSION *session, session, return 0, return)
@@ -224,7 +245,9 @@ DEFINEFUNC5(int, OCSP_id_get0_info, ASN1_OCTET_STRING **piNameHash, piNameHash,
             ASN1_OCTET_STRING **piKeyHash, piKeyHash, ASN1_INTEGER **pserial, pserial, OCSP_CERTID *cid, cid,
             return 0, return)
 DEFINEFUNC2(OCSP_RESPONSE *, OCSP_response_create, int status, status, OCSP_BASICRESP *bs, bs, return nullptr, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC(const STACK_OF(X509) *, OCSP_resp_get0_certs, const OCSP_BASICRESP *bs, bs, return nullptr, return)
+#endif
 DEFINEFUNC2(int, OCSP_id_cmp, OCSP_CERTID *a, a, OCSP_CERTID *b, b, return -1, return)
 DEFINEFUNC7(OCSP_SINGLERESP *, OCSP_basic_add1_status, OCSP_BASICRESP *r, r, OCSP_CERTID *c, c, int s, s,
             int re, re, ASN1_TIME *rt, rt, ASN1_TIME *t, t, ASN1_TIME *n, n, return nullptr, return)
@@ -269,7 +292,7 @@ DEFINEFUNC2(int, EVP_CIPHER_CTX_set_key_length, EVP_CIPHER_CTX *ctx, ctx, int ke
 DEFINEFUNC5(int, EVP_CipherInit, EVP_CIPHER_CTX *ctx, ctx, const EVP_CIPHER *type, type, const unsigned char *key, key, const unsigned char *iv, iv, int enc, enc, return 0, return)
 DEFINEFUNC6(int, EVP_CipherInit_ex, EVP_CIPHER_CTX *ctx, ctx, const EVP_CIPHER *cipher, cipher, ENGINE *impl, impl, const unsigned char *key, key, const unsigned char *iv, iv, int enc, enc, return 0, return)
 DEFINEFUNC5(int, EVP_CipherUpdate, EVP_CIPHER_CTX *ctx, ctx, unsigned char *out, out, int *outl, outl, const unsigned char *in, in, int inl, inl, return 0, return)
-DEFINEFUNC3(int, EVP_CipherFinal, EVP_CIPHER_CTX *ctx, ctx, unsigned char *out, out, int *outl, outl, return 0, return)
+DEFINEFUNC3(int, EVP_CipherFinal_ex, EVP_CIPHER_CTX *ctx, ctx, unsigned char *out, out, int *outl, outl, return 0, return)
 DEFINEFUNC(const EVP_MD *, EVP_get_digestbyname, const char *name, name, return nullptr, return)
 #ifndef OPENSSL_NO_DES
 DEFINEFUNC(const EVP_CIPHER *, EVP_des_cbc, DUMMYARG, DUMMYARG, return nullptr, return)
@@ -356,12 +379,14 @@ DEFINEFUNC2(int, SSL_CTX_use_PrivateKey, SSL_CTX *a, a, EVP_PKEY *b, b, return -
 DEFINEFUNC2(int, SSL_CTX_use_RSAPrivateKey, SSL_CTX *a, a, RSA *b, b, return -1, return)
 DEFINEFUNC3(int, SSL_CTX_use_PrivateKey_file, SSL_CTX *a, a, const char *b, b, int c, c, return -1, return)
 DEFINEFUNC(X509_STORE *, SSL_CTX_get_cert_store, const SSL_CTX *a, a, return nullptr, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC(SSL_CONF_CTX *, SSL_CONF_CTX_new, DUMMYARG, DUMMYARG, return nullptr, return);
 DEFINEFUNC(void, SSL_CONF_CTX_free, SSL_CONF_CTX *a, a, return ,return);
 DEFINEFUNC2(void, SSL_CONF_CTX_set_ssl_ctx, SSL_CONF_CTX *a, a, SSL_CTX *b, b, return, return);
 DEFINEFUNC2(unsigned int, SSL_CONF_CTX_set_flags, SSL_CONF_CTX *a, a, unsigned int b, b, return 0, return);
 DEFINEFUNC(int, SSL_CONF_CTX_finish, SSL_CONF_CTX *a, a, return 0, return);
 DEFINEFUNC3(int, SSL_CONF_cmd, SSL_CONF_CTX *a, a, const char *b, b, const char *c, c, return 0, return);
+#endif
 DEFINEFUNC(void, SSL_free, SSL *a, a, return, DUMMYARG)
 DEFINEFUNC(STACK_OF(SSL_CIPHER) *, SSL_get_ciphers, const SSL *a, a, return nullptr, return)
 DEFINEFUNC(const SSL_CIPHER *, SSL_get_current_cipher, SSL *a, a, return nullptr, return)
@@ -378,7 +403,9 @@ DEFINEFUNC3(void, SSL_set_bio, SSL *a, a, BIO *b, b, BIO *c, c, return, DUMMYARG
 DEFINEFUNC(void, SSL_set_accept_state, SSL *a, a, return, DUMMYARG)
 DEFINEFUNC(void, SSL_set_connect_state, SSL *a, a, return, DUMMYARG)
 DEFINEFUNC(int, SSL_shutdown, SSL *a, a, return -1, return)
+#ifndef LIBRESSL_VERSION_NUMBER
 DEFINEFUNC(int, SSL_in_init, const SSL *a, a, return 0, return)
+#endif
 DEFINEFUNC(int, SSL_get_shutdown, const SSL *ssl, ssl, return 0, return)
 DEFINEFUNC2(int, SSL_set_session, SSL* to, to, SSL_SESSION *session, session, return -1, return)
 DEFINEFUNC(void, SSL_SESSION_free, SSL_SESSION *ses, ses, return, DUMMYARG)
@@ -846,20 +873,26 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(EVP_CIPHER_CTX_reset)
     RESOLVEFUNC(EVP_PKEY_up_ref)
     RESOLVEFUNC(EVP_PKEY_CTX_new)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(EVP_PKEY_param_check)
+#endif
     RESOLVEFUNC(EVP_PKEY_CTX_free)
     RESOLVEFUNC(EVP_PKEY_base_id)
     RESOLVEFUNC(RSA_bits)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(OPENSSL_sk_new_null)
     RESOLVEFUNC(OPENSSL_sk_push)
     RESOLVEFUNC(OPENSSL_sk_free)
     RESOLVEFUNC(OPENSSL_sk_num)
     RESOLVEFUNC(OPENSSL_sk_pop_free)
     RESOLVEFUNC(OPENSSL_sk_value)
+#endif
     RESOLVEFUNC(DH_get0_pqg)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(SSL_CTX_set_options)
     RESOLVEFUNC(SSL_CTX_get_security_level)
     RESOLVEFUNC(SSL_CTX_set_security_level)
+#endif
 #ifdef TLS1_3_VERSION
     RESOLVEFUNC(SSL_CTX_set_ciphersuites)
     RESOLVEFUNC(SSL_set_psk_use_session_callback)
@@ -869,9 +902,13 @@ bool q_resolveOpenSslSymbols()
 
     RESOLVEFUNC(SSL_get_client_random)
     RESOLVEFUNC(SSL_SESSION_get_master_key)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(SSL_session_reused)
+#endif
     RESOLVEFUNC(SSL_get_session)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(SSL_set_options)
+#endif
     RESOLVEFUNC(CRYPTO_get_ex_new_index)
     RESOLVEFUNC(TLS_method)
     RESOLVEFUNC(TLS_client_method)
@@ -898,7 +935,9 @@ bool q_resolveOpenSslSymbols()
 
     RESOLVEFUNC(SSL_SESSION_get_ticket_lifetime_hint)
     RESOLVEFUNC(DH_bits)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(DSA_bits)
+#endif
 
 #if QT_CONFIG(dtls)
     RESOLVEFUNC(DTLSv1_listen)
@@ -928,7 +967,9 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(OCSP_check_validity)
     RESOLVEFUNC(OCSP_cert_to_id)
     RESOLVEFUNC(OCSP_id_get0_info)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(OCSP_resp_get0_certs)
+#endif
     RESOLVEFUNC(OCSP_basic_sign)
     RESOLVEFUNC(OCSP_response_create)
     RESOLVEFUNC(i2d_OCSP_RESPONSE)
@@ -965,7 +1006,9 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(EC_GROUP_get_degree)
 #endif
     RESOLVEFUNC(BN_num_bits)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(BN_is_word)
+#endif
     RESOLVEFUNC(BN_mod_word)
     RESOLVEFUNC(DSA_new)
     RESOLVEFUNC(DSA_free)
@@ -979,7 +1022,7 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(EVP_CipherInit)
     RESOLVEFUNC(EVP_CipherInit_ex)
     RESOLVEFUNC(EVP_CipherUpdate)
-    RESOLVEFUNC(EVP_CipherFinal)
+    RESOLVEFUNC(EVP_CipherFinal_ex)
     RESOLVEFUNC(EVP_get_digestbyname)
 #ifndef OPENSSL_NO_DES
     RESOLVEFUNC(EVP_des_cbc)
@@ -1058,12 +1101,14 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(SSL_CTX_use_RSAPrivateKey)
     RESOLVEFUNC(SSL_CTX_use_PrivateKey_file)
     RESOLVEFUNC(SSL_CTX_get_cert_store);
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(SSL_CONF_CTX_new);
     RESOLVEFUNC(SSL_CONF_CTX_free);
     RESOLVEFUNC(SSL_CONF_CTX_set_ssl_ctx);
     RESOLVEFUNC(SSL_CONF_CTX_set_flags);
     RESOLVEFUNC(SSL_CONF_CTX_finish);
     RESOLVEFUNC(SSL_CONF_cmd);
+#endif
     RESOLVEFUNC(SSL_accept)
     RESOLVEFUNC(SSL_clear)
     RESOLVEFUNC(SSL_connect)
@@ -1083,7 +1128,9 @@ bool q_resolveOpenSslSymbols()
     RESOLVEFUNC(SSL_set_bio)
     RESOLVEFUNC(SSL_set_connect_state)
     RESOLVEFUNC(SSL_shutdown)
+#ifndef LIBRESSL_VERSION_NUMBER
     RESOLVEFUNC(SSL_in_init)
+#endif
     RESOLVEFUNC(SSL_get_shutdown)
     RESOLVEFUNC(SSL_set_session)
     RESOLVEFUNC(SSL_SESSION_free)
diff --git a/src/network/ssl/qsslsocket_openssl_symbols_p.h b/src/network/ssl/qsslsocket_openssl_symbols_p.h
index c46afcf5..4daba4ac 100644
--- a/src/network/ssl/qsslsocket_openssl_symbols_p.h
+++ b/src/network/ssl/qsslsocket_openssl_symbols_p.h
@@ -80,6 +80,13 @@ QT_BEGIN_NAMESPACE
 
 #define DUMMYARG
 
+#ifdef LIBRESSL_VERSION_NUMBER
+typedef _STACK STACK;
+typedef STACK OPENSSL_STACK;
+typedef void OPENSSL_INIT_SETTINGS;
+typedef int (*X509_STORE_CTX_verify_cb)(int ok,X509_STORE_CTX *ctx);
+#endif
+
 #if !defined QT_LINKED_OPENSSL
 // **************** Shared declarations ******************
 // ret func(arg)
@@ -230,7 +237,11 @@ const unsigned char * q_ASN1_STRING_get0_data(const ASN1_STRING *x);
 Q_AUTOTEST_EXPORT BIO *q_BIO_new(const BIO_METHOD *a);
 Q_AUTOTEST_EXPORT const BIO_METHOD *q_BIO_s_mem();
 
+#ifndef LIBRESSL_VERSION_NUMBER
 int q_DSA_bits(DSA *a);
+#else
+#define q_DSA_bits(dsa) q_BN_num_bits((dsa)->p)
+#endif
 int q_EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c);
 Q_AUTOTEST_EXPORT int q_EVP_PKEY_up_ref(EVP_PKEY *a);
 EVP_PKEY_CTX *q_EVP_PKEY_CTX_new(EVP_PKEY *pkey, ENGINE *e);
@@ -238,14 +249,33 @@ void q_EVP_PKEY_CTX_free(EVP_PKEY_CTX *ctx);
 int q_EVP_PKEY_param_check(EVP_PKEY_CTX *ctx);
 int q_EVP_PKEY_base_id(EVP_PKEY *a);
 int q_RSA_bits(RSA *a);
+
+#ifndef LIBRESSL_VERSION_NUMBER
 Q_AUTOTEST_EXPORT int q_OPENSSL_sk_num(OPENSSL_STACK *a);
 Q_AUTOTEST_EXPORT void q_OPENSSL_sk_pop_free(OPENSSL_STACK *a, void (*b)(void *));
 Q_AUTOTEST_EXPORT OPENSSL_STACK *q_OPENSSL_sk_new_null();
 Q_AUTOTEST_EXPORT void q_OPENSSL_sk_push(OPENSSL_STACK *st, void *data);
 Q_AUTOTEST_EXPORT void q_OPENSSL_sk_free(OPENSSL_STACK *a);
 Q_AUTOTEST_EXPORT void * q_OPENSSL_sk_value(OPENSSL_STACK *a, int b);
+#else // LIBRESSL_VERSION_NUMBER
+int q_sk_num(STACK *a);
+#define q_OPENSSL_sk_num(a) q_sk_num(a)
+void q_sk_pop_free(STACK *a, void (*b)(void *));
+#define q_OPENSSL_sk_pop_free(a, b) q_sk_pop_free(a, b)
+STACK *q_sk_new_null();
+#define q_OPENSSL_sk_new_null() q_sk_new_null()
+void q_sk_push(STACK *st, void *data);
+#define q_OPENSSL_sk_push(st, data) q_sk_push(st, data)
+void q_sk_free(STACK *a);
+#define q_OPENSSL_sk_free q_sk_free
+void *q_sk_value(STACK *a, int b);
+#define q_OPENSSL_sk_value(a, b) q_sk_value(a, b)
+#endif // LIBRESSL_VERSION_NUMBER
+
+#ifndef LIBRESSL_VERSION_NUMBER
 int q_SSL_session_reused(SSL *a);
 unsigned long q_SSL_CTX_set_options(SSL_CTX *ctx, unsigned long op);
+#endif
 int q_OPENSSL_init_ssl(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings);
 size_t q_SSL_get_client_random(SSL *a, unsigned char *out, size_t outlen);
 size_t q_SSL_SESSION_get_master_key(const SSL_SESSION *session, unsigned char *out, size_t outlen);
@@ -269,8 +299,13 @@ int q_DH_bits(DH *dh);
 # define q_SSL_load_error_strings() q_OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS \
                                                        | OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL)
 
+#ifndef LIBRESSL_VERSION_NUMBER
 #define q_SKM_sk_num(type, st) ((int (*)(const STACK_OF(type) *))q_OPENSSL_sk_num)(st)
 #define q_SKM_sk_value(type, st,i) ((type * (*)(const STACK_OF(type) *, int))q_OPENSSL_sk_value)(st, i)
+#else
+#define q_SKM_sk_num(type, st) ((int (*)(const STACK_OF(type) *))q_sk_num)(st)
+#define q_SKM_sk_value(type, st,i) ((type * (*)(const STACK_OF(type) *, int))q_sk_value)(st, i)
+#endif // LIBRESSL_VERSION_NUMBER
 
 #define q_OPENSSL_add_all_algorithms_conf()  q_OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS \
                                                                    | OPENSSL_INIT_ADD_ALL_DIGESTS \
@@ -279,13 +314,19 @@ int q_DH_bits(DH *dh);
                                                                     | OPENSSL_INIT_ADD_ALL_DIGESTS, NULL)
 
 int q_OPENSSL_init_crypto(uint64_t opts, const OPENSSL_INIT_SETTINGS *settings);
+#ifndef LIBRESSL_VERSION_NUMBER
 void q_CRYPTO_free(void *str, const char *file, int line);
+#else
+void q_CRYPTO_free(void *a);
+#endif
 
 long q_OpenSSL_version_num();
 const char *q_OpenSSL_version(int type);
 
 unsigned long q_SSL_SESSION_get_ticket_lifetime_hint(const SSL_SESSION *session);
+#ifndef LIBRESSL_VERSION_NUMBER
 unsigned long q_SSL_set_options(SSL *s, unsigned long op);
+#endif
 
 #ifdef TLS1_3_VERSION
 int q_SSL_CTX_set_ciphersuites(SSL_CTX *ctx, const char *str);
@@ -374,7 +415,9 @@ BIO *q_BIO_new_mem_buf(void *a, int b);
 int q_BIO_read(BIO *a, void *b, int c);
 Q_AUTOTEST_EXPORT int q_BIO_write(BIO *a, const void *b, int c);
 int q_BN_num_bits(const BIGNUM *a);
+#ifndef LIBRESSL_VERSION_NUMBER
 int q_BN_is_word(BIGNUM *a, BN_ULONG w);
+#endif
 BN_ULONG q_BN_mod_word(const BIGNUM *a, BN_ULONG w);
 
 #ifndef OPENSSL_NO_EC
@@ -395,7 +438,7 @@ int q_EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *x, int keylen);
 int q_EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *type, const unsigned char *key, const unsigned char *iv, int enc);
 int q_EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, ENGINE *impl, const unsigned char *key, const unsigned char *iv, int enc);
 int q_EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, const unsigned char *in, int inl);
-int q_EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl);
+int q_EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl);
 const EVP_MD *q_EVP_get_digestbyname(const char *name);
 
 #ifndef OPENSSL_NO_DES
@@ -497,12 +540,14 @@ int q_SSL_CTX_use_PrivateKey(SSL_CTX *a, EVP_PKEY *b);
 int q_SSL_CTX_use_RSAPrivateKey(SSL_CTX *a, RSA *b);
 int q_SSL_CTX_use_PrivateKey_file(SSL_CTX *a, const char *b, int c);
 X509_STORE *q_SSL_CTX_get_cert_store(const SSL_CTX *a);
+#ifndef LIBRESSL_VERSION_NUMBER
 SSL_CONF_CTX *q_SSL_CONF_CTX_new();
 void q_SSL_CONF_CTX_free(SSL_CONF_CTX *a);
 void q_SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *a, SSL_CTX *b);
 unsigned int q_SSL_CONF_CTX_set_flags(SSL_CONF_CTX *a, unsigned int b);
 int q_SSL_CONF_CTX_finish(SSL_CONF_CTX *a);
 int q_SSL_CONF_cmd(SSL_CONF_CTX *a, const char *b, const char *c);
+#endif
 void q_SSL_free(SSL *a);
 STACK_OF(SSL_CIPHER) *q_SSL_get_ciphers(const SSL *a);
 const SSL_CIPHER *q_SSL_get_current_cipher(SSL *a);
@@ -513,13 +558,15 @@ X509 *q_SSL_get_peer_certificate(SSL *a);
 long q_SSL_get_verify_result(const SSL *a);
 SSL *q_SSL_new(SSL_CTX *a);
 SSL_CTX *q_SSL_get_SSL_CTX(SSL *a);
-long q_SSL_ctrl(SSL *ssl,int cmd, long larg, void *parg);
+long q_SSL_ctrl(SSL *ssl, int cmd, long larg, void *parg);
 int q_SSL_read(SSL *a, void *b, int c);
 void q_SSL_set_bio(SSL *a, BIO *b, BIO *c);
 void q_SSL_set_accept_state(SSL *a);
 void q_SSL_set_connect_state(SSL *a);
 int q_SSL_shutdown(SSL *a);
+#ifndef LIBRESSL_VERSION_NUMBER
 int q_SSL_in_init(const SSL *s);
+#endif
 int q_SSL_get_shutdown(const SSL *ssl);
 int q_SSL_set_session(SSL *to, SSL_SESSION *session);
 void q_SSL_SESSION_free(SSL_SESSION *ses);
@@ -728,7 +775,11 @@ int q_OCSP_check_validity(ASN1_GENERALIZEDTIME *thisupd, ASN1_GENERALIZEDTIME *n
 int q_OCSP_id_get0_info(ASN1_OCTET_STRING **piNameHash, ASN1_OBJECT **pmd, ASN1_OCTET_STRING **pikeyHash,
                         ASN1_INTEGER **pserial, OCSP_CERTID *cid);
 
+#ifndef LIBRESSL_VERSION_NUMBER
 const STACK_OF(X509) *q_OCSP_resp_get0_certs(const OCSP_BASICRESP *bs);
+#else
+#define q_OCSP_resp_get0_certs(bs) ((bs)->certs)
+#endif
 Q_AUTOTEST_EXPORT OCSP_CERTID *q_OCSP_cert_to_id(const EVP_MD *dgst, X509 *subject, X509 *issuer);
 Q_AUTOTEST_EXPORT void q_OCSP_CERTID_free(OCSP_CERTID *cid);
 int q_OCSP_id_cmp(OCSP_CERTID *a, OCSP_CERTID *b);