bind/OPTIONS.md

Setting the CPPFLAGS environment variable before running configure can be used to enable certain compile-time options that are not explicitly defined in configure.

Some of these settings are:

Setting	Description
-DCHECK_LOCAL=0	Don't check out-of-zone addresses in named-checkzone
-DCHECK_SIBLING=0	Don't check sibling glue in named-checkzone
-DISC_FACILITY=LOG_LOCAL0	Change the default syslog facility for named
-DISC_HEAP_CHECK	Test heap consistency after every heap operation; used when debugging
-DISC_MEM_DEFAULTFILL=1	Overwrite memory with tag values when allocating or freeing it; this impairs performance but makes debugging of memory problems easier
-DISC_MEM_TRACKLINES=0	Don't track memory allocations by file and line number; this improves performance but makes debugging more difficult
-DNAMED_RUN_PID_DIR=0	Create default PID files in ${localstatedir}/run rather than ${localstatedir}/run/named/
-DNS_CLIENT_DROPPORT=0	Disable dropping queries from particular well-known ports
-DOPENSSL_API_COMPAT=10100	Build using the deprecated OpenSSL APIs so that the engine API is available when building with OpenSSL 3.0.0 for PKCS#11 support