I can compile cyrus imapd I found solution to add in ebuid script in configure section --with-cyrus-user=cyrus \ --with-cyrus-group=mail \ --enable-shared \ --enable-netscapehack \ --with-com_err=yes \
The cyrus-imapd-2.1.5.ebuild has been updated with your configure options. Thanks for the suggestion! emerge rsync emerge cyrus-imapd