made openssl support optional

configure.seed

@@ -25,6 +25,15 @@ else
   N2N_LIBS="-lzstd ${N2N_LIBS}"
 fi
 
+
+AC_ARG_WITH([openssl],
+ [AS_HELP_STRING([--with-openssl],
+ [enable support for OpenSSL])],
+ [],
+ [with_openssl=no])
+
+if test "x$with_openssl" != xno; then
+
   AC_CHECK_LIB([crypto], [AES_cbc_encrypt])
 
   if test "x$ac_cv_lib_crypto_AES_cbc_encrypt" != xyes; then
@@ -47,6 +56,8 @@ else
     AC_DEFINE([HAVE_OPENSSL_1_1], [], [OpenSSL 1.1 is present])
   fi
 
+fi
+
 AC_CHECK_LIB([pcap], [pcap_open_live], pcap=true)
 
 if test x$pcap != x; then