--- contrib/mod_proxy/lib/proxy/ssh.c
+++ contrib/mod_proxy/lib/proxy/ssh.c
@@ -44,6 +44,7 @@
 #include "proxy/ssh/utf8.h"
 
 #if defined(PR_USE_OPENSSL)
+#include <openssl/conf.h>
 #include <openssl/err.h>
 #include <openssl/ssl.h>
 
--- contrib/mod_proxy/lib/proxy/ssh/crypto.c
+++ contrib/mod_proxy/lib/proxy/ssh/crypto.c
@@ -36,6 +36,12 @@
 #endif /* !OPENSSL_NO_DES */
 #include <openssl/err.h>
 
+#if OPENSSL_VERSION_NUMBER > 0x000907000L && \
+    OPENSSL_VERSION_NUMBER < 0x10100000L
+#include <openssl/engine.h>
+static const char *crypto_engine = NULL;
+#endif
+
 struct proxy_ssh_cipher {
   const char *name;
   const char *openssl_name;