[Dovecot] sieve / managesieve: unknown Sieve capability 'imapflags'

$HOME/.dovecot.sieve.log reports:

main_script: line 8: error: require command: unknown Sieve capability 'imapflags'. main_script: line 8: error: require command: unknown Sieve capability 'notify'. main_script: error: validation failed.

I'm using sieve (not cmusieve) and managesieve with dovecot-1.2. SquirrelMail 1.4 is using the avelsieve plugin to created/edit the sieve rules.

What am I doing wrong here?

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