+--with-ssl; they are not included in the standard build. Fetchmail's
+configure script will probe some default locations for the
+include/openssl/ssl.h file. If this doesn't work (i. e. configure prints
+"SSL support enabled, but OpenSSL not found" and aborts), you need to
+give the explicit prefix of your OpenSSL installation (specify the
+directory that contains OpenSSL's "include" subdirectory), for instance:
+"--with-ssl=/example/path" would assume that you have an
+/example/path/include/openssl/ssl.h header file.