Prevent removal of configured files after Portfile change

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Hi, is it possible to prevent the complete removal of all configured/compiled data if the Portfile was changed. I'm just updating configuration parameters but port completely removes the project data and starts again. Thanks for your help, Simon - -- + privacy is necessary + using http://gnupg.org + public key id: 0x6115F804EFB33229 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) iD8DBQFGkUCpYRX4BO+zMikRCmqJAKDB0nlMLlpEi3/PMkEx9nXShkrucgCgrcF7 N67UPiiRSCankBTt8s9i1t8= =SOD+ -----END PGP SIGNATURE-----