asterisk: IMAP_STORAGE not useful
If IMAP support is expected option "--enable IMAP_STORAGE" doesn't work as it should. With this option build log contains 'IMAP_STORAGE not found' and necessary module app_voicemail_imap.so not being compiled, only app_voicemail.so and asterisk haven't IMAP support. After replacement with "--enable app_voicemail_imap" everything works. Feature with compiling all three storages at once appeared from asterisk 17.