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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 |
|