https://github.com/shellinabox/shellinabox/pull/477/commits/81bce5782b34e81e78aa5bcd18d7cf54a5228bad

diff --git a/libhttp/ssl.c b/libhttp/ssl.c
index 6d09035..c0f6796 100644
--- a/libhttp/ssl.c
+++ b/libhttp/ssl.c
@@ -1016,11 +1016,15 @@ int sslPromoteToSSL(struct SSLSupport *ssl, SSL **sslHndl, int fd,
 }
 
 BIO *sslGetNextBIO(BIO *b) {
-#if OPENSSL_VERSION_NUMBER <= 0x10100000L
-  return b->next_bio;
-#else
-  return BIO_next(b);
-#endif
+    #if defined(HAVE_OPENSSL)
+        #if OPENSSL_VERSION_NUMBER <= 0x10100000L
+            return b->next_bio;
+        #else
+            return BIO_next(b);
+        #endif
+    #else
+        return NULL;
+    #endif
 }
 
 void sslFreeHndl(SSL **sslHndl) {