svnsync: PROPFIND of '....': Server certificate verification failed: issuer is not trusted

One of my friends add a SSL in his SVN, and I got Server certificate verification failed: issuer is not trusted

# svnsync --non-interactive sync

svnsync: PROPFIND request failed on '.....'

svnsync: PROPFIND of '....': Server certificate verification failed: issuer is not trusted ()

To fix, run svnsync without "--non-interactive", that will prompt you to store the cert (p)ermanently in the .subversion directory. Example:

# svnsync sync 

Error validating server certificate for '........':

 - The certificate is not issued by a trusted authority. Use the fingerprint to validate the certificate manually!

Certificate information:

 - Hostname: .....

 - Valid: from ....

 - Issuer: .....

 - Fingerprint:

(R)eject, accept (t)emporarily or accept (p)ermanently? p

Authentication realm: <....> ....