If you get one of the following errors, or something similar, your C-language library
lacks support for the required POSIX regular expression library routines:
undefined reference to 'regcomp'
or
pattern-compile-error: : Operation not applicable
or
ld: Undefined symbol
_regexec
_regcomp
_regerror
If you lack the needed library support, see ?§3.1.2 on page 104 for instructions on how to
download and install regex libraries.
If you are running a precompiled sendmail binary, you can use the -d0.10 debugging
command-line switch(?§15.7.3 on page 543) to determine if MAP_REGEX support is
defined (if it appears in the list, it is defined).
3.4.30 NDBM
Support Unix ndbm(3) databases Tune with confMAPDEF
The ndbm(3) form of database uses two files (.pag and .dir) for eachdatabase. Databases
cannot be shared by different architectures across a network. If you intend to support
aliasing in an efficient manner, you should at least define this NDBM (or NEWDB,
described next) in your Build m4 file:
APPENDDEF(`confMAPDEF??, `-DNDBM??)
The ndbm(3) routines are used primarily to look up aliases. They can also be used to
declare dbm-type maps (?§23.2.2 on page 882) with the K configuration command.
Library routines to support ndbm(3) are available withmost modern commercial versions
of Unix. You might have to specify library support with an -lndbm in the confLIBS line of
your Build m4 file.
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