+If configuring with --with-cyrus-sasl, install these Cygwin packages:
+ libsasl2
+ libsasl2-devel
+
+If configuring with --with-tls, install these Cygwin packages:
+ gnutls-devel
+ libgnutls26
+
+Note that the -link switch to refile cannot be used on FAT32 and
+similar filesystems.
+