-1. Prerequisites
----------------
A C compiler. Any C89 or better compiler should work. Where supported,
--with-ssl-engine enables Libre/OpenSSL's (hardware) ENGINE support
+--without-openssl builds without using OpenSSL. Only a subset of ciphers
+and algorithms are supported in this configuration.
+
+--without-zlib builds without zlib. This disables the Compression option.
+
--with-4in6 Check for IPv4 in IPv6 mapped addresses and convert them to
real (AF_INET) IPv4 addresses. Works around some quirks on Linux.