This release works ONLY with versions 0.101.x of the library.

Scan options in version 101 need to be changed to new names
as follows (see avfilter.conf man page for more details):

    OLD OPTION:             NEW_OPTION:
    algorithmic_detection   heuristic_alerts
    detect_broken           alert_broken
    phishing_cloak          alert_phishing_cloak
    phishing_ssl            alert_phishing_ssl
    partition_intersection  alert_partition_intersection
    block_max               alert_exceeds_max
    block_macros            alert_macros
    block_encrypted         alert_encrypted
                            alert_encrypted_archive
                            alert_encrypted_doc

The 3.5c release contains minor corrections (Courier version,
inclusion of these notes, timeout in avfilter_sig).