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25.7. Standard Modules
In general, the standard modules (modules bundled with Perl) work on
all platforms. Notable exceptions are the CPAN.pm module (which
currently makes connections to external programs that may not be
available), platform-specific modules (such as ExtUtils::MM_VMS), and
DBM modules.There is no single DBM module available on all platforms.
SDBM_File and the others are generally available on
all Unix and DOSish ports, but not in MacPerl, where only
NBDM_File and DB_File are
available.The good news is that at least one DBM module should be available, and
AnyDBM_File will use whichever module it can find.
With such uncertainty, you should use only the features common to all
DBM implementations. For instance, keep your records to no more than
1K bytes. See the AnyDBM_File module documentation
for more details.