Later versions of HTCondor should remove all of these limitations.
 
-*: ENABLE_IPV6 must be specifed in your global HTCondor configuration file, not in one of you local configuration files (the ones specified with LOCAL_CONFIG_FILE or LOCAL_CONFIG_DIR). #3277
+*: ENABLE_IPV6 must be specifed in your global HTCondor configuration file, not in one of you local configuration files (the ones specified with LOCAL_CONFIG_FILE or LOCAL_CONFIG_DIR), nor using the environment variable _CONDOR_ENABLE_IPV6. #3277
 *: Microsoft Windows is not supported.
 *: Mixed IPv4/IPv6 pools are not supported.
 *: Security policies cannot use IP addresses, only hostnames.  (If you use NO_DNS=TRUE, the "hostnames" are reformatted IP addresses, and you can match against those.)