alpine refuses to save imap password

I have compiled alpine 2.20 with option --with-passfile=/home/fuji/.alpine.pwd and when I type the imap password of gmail, I get my mails but when it comes to save the password, i get the following debug messages: 14:05:34.653790 Looking for passfile "/home/fuji/.alpine.pwd" 14:05:34.655538 q_status_message(Attempting to encrypt password file) 14:05:34.656276 q_status_message(Refusing to write non-encrypted password file) 14:05:34.656322 IMAP DEBUG 14:05:34.656322: and ll ~/.alpine.pwd -rw------- 1 fuji opera 0 Dec 20 17:42 .alpine.pwd How can I save that password? Thanks.