ext_ldap_group_acl(8) on Linux
The text bd24fa5d3de2, as Debian 10 (Buster) shipped it.
Squid LDAP external acl group helper Version 2.18
Flags it lists
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-B -
-D -
-E -
-F -
-K -
-P -
-R -
-S -
-W -
-Z -
-a -
-b -
-d -
-f -
-g -
-s -
-u -
-w