--- /dev/null
+--- a/src/main/threads.c
++++ b/src/main/threads.c
+@@ -298,6 +298,7 @@ static void ssl_locking_function(int mode, int n, UNUSED char const *file, UNUSE
+ */
+ int tls_mutexes_init(void)
+ {
++#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
+ int i;
+
+ ssl_mutexes = rad_malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t));
+@@ -316,6 +317,7 @@ int tls_mutexes_init(void)
+ #ifdef HAVE_CRYPTO_SET_LOCKING_CALLBACK
+ CRYPTO_set_locking_callback(ssl_locking_function);
+ #endif
++#endif
+
+ return 0;
+ }
+--- a/src/main/tls.c
++++ b/src/main/tls.c
+@@ -55,6 +55,7 @@ USES_APPLE_DEPRECATED_API /* OpenSSL API has been deprecated by Apple */
+ # include <openssl/evp.h>
+ # endif
+ # include <openssl/ssl.h>
++# include <openssl/dh.h>
+
+ #define LOG_PREFIX "tls"
+
+@@ -2133,7 +2134,7 @@ int cbtls_verify(int ok, X509_STORE_CTX *ctx)
+ int my_ok = ok;
+
+ ASN1_INTEGER *sn = NULL;
+- ASN1_TIME *asn_time = NULL;
++ const ASN1_TIME *asn_time = NULL;
+ VALUE_PAIR **certs;
+ char **identity;
+ #ifdef HAVE_OPENSSL_OCSP_H
+@@ -2207,7 +2208,7 @@ int cbtls_verify(int ok, X509_STORE_CTX *ctx)
+ * Get the Expiration Date
+ */
+ buf[0] = '\0';
+- asn_time = X509_get_notAfter(client_cert);
++ asn_time = X509_get0_notAfter(client_cert);
+ if (certs && (lookup <= 1) && asn_time &&
+ (asn_time->length < (int) sizeof(buf))) {
+ memcpy(buf, (char*) asn_time->data, asn_time->length);
+@@ -2220,7 +2221,7 @@ int cbtls_verify(int ok, X509_STORE_CTX *ctx)
+ * Get the Valid Since Date
+ */
+ buf[0] = '\0';
+- asn_time = X509_get_notBefore(client_cert);
++ asn_time = X509_get0_notBefore(client_cert);
+ if (certs && (lookup <= 1) && asn_time &&
+ (asn_time->length < (int) sizeof(buf))) {
+ memcpy(buf, (char*) asn_time->data, asn_time->length);
+@@ -2690,10 +2691,12 @@ static int set_ecdh_curve(SSL_CTX *ctx, char const *ecdh_curve, bool disable_sin
+ */
+ int tls_global_init(bool spawn_flag, bool check)
+ {
++#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ SSL_load_error_strings(); /* readable error messages (examples show call before library_init) */
+ SSL_library_init(); /* initialize library */
+ OpenSSL_add_all_algorithms(); /* required for SHA2 in OpenSSL < 0.9.8o and 1.0.0.a */
+ CONF_modules_load_file(NULL, NULL, 0);
++#endif
+
+ /*
+ * Initialize the index for the certificates.
+@@ -2769,6 +2772,7 @@ int tls_global_version_check(char const *acknowledged)
+ */
+ void tls_global_cleanup(void)
+ {
++#if OPENSSL_VERSION_NUMBER < 0x10100000L
+ #if OPENSSL_VERSION_NUMBER < 0x10000000L
+ ERR_remove_state(0);
+ #elif OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
+@@ -2781,6 +2785,7 @@ void tls_global_cleanup(void)
+ ERR_free_strings();
+ EVP_cleanup();
+ CRYPTO_cleanup_all_ex_data();
++#endif
+ }
+
+
+--- a/src/main/version.c
++++ b/src/main/version.c
+@@ -54,7 +54,7 @@ int ssl_check_consistency(void)
+ {
+ long ssl_linked;
+
+- ssl_linked = SSLeay();
++ ssl_linked = OpenSSL_version_num();
+
+ /*
+ * Major and minor versions mismatch, that's bad.
+@@ -152,7 +152,7 @@ char const *ssl_version_num(void)
+ {
+ long ssl_linked;
+
+- ssl_linked = SSLeay();
++ ssl_linked = OpenSSL_version_num();
+ return ssl_version_by_num((uint32_t)ssl_linked);
+ }
+
+@@ -188,10 +188,10 @@ char const *ssl_version(void)
+ {
+ static char buffer[256];
+
+- uint32_t v = SSLeay();
++ uint32_t v = OpenSSL_version_num();
+
+ snprintf(buffer, sizeof(buffer), "%s 0x%.8x (%s)",
+- SSLeay_version(SSLEAY_VERSION), /* Not all builds include a useful version number */
++ OpenSSL_version(OPENSSL_VERSION), /* Not all builds include a useful version number */
+ v,
+ ssl_version_by_num(v));
+