diff -upr httpd-2.4.33/modules/ssl/ssl_engine_init.c httpd-2.4.33.new/modules/ssl/ssl_engine_init.c
--- httpd-2.4.33/modules/ssl/ssl_engine_init.c	Wed Feb 14 08:43:36 2018
+++ httpd-2.4.33.new/modules/ssl/ssl_engine_init.c	Sat Apr 21 19:12:34 2018
@@ -51,7 +51,7 @@ APR_IMPLEMENT_OPTIONAL_HOOK_RUN_ALL(ssl, SSL, int, ini
 #if MODSSL_USE_OPENSSL_PRE_1_1_API
 /* 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)
+int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
 {
     /* q is optional */
     if (p == NULL || g == NULL)