SSL: initialization changes for OpenSSL 1.1.0. OPENSSL_config() deprecated in OpenSSL 1.1.0. Additionally, SSL_library_init(), SSL_load_error_strings() and OpenSSL_add_all_algorithms() are no longer available if OPENSSL_API_COMPAT is set to 0x10100000L. The OPENSSL_init_ssl() function is now used instead with appropriate arguments to trigger the same behaviour. The configure test changed to use SSL_CTX_set_options(). Deinitialization now happens automatically in OPENSSL_cleanup() called via atexit(3), so we no longer call EVP_cleanup() and ENGINE_cleanup() directly.

--- a/auto/lib/openssl/conf
+++ b/auto/lib/openssl/conf
@@ -52,7 +52,7 @@ else
         ngx_feature_incs="#include <openssl/ssl.h>"
         ngx_feature_path=
         ngx_feature_libs="-lssl -lcrypto $NGX_LIBDL"
-        ngx_feature_test="SSL_library_init()"
+        ngx_feature_test="SSL_CTX_set_options(NULL, 0)"
         . auto/feature
 
         if [ $ngx_found = no ]; then