Plan 9 from Bell Labs’s /usr/web/sources/contrib/gabidiaz/root/sys/src/cmd/perl/ext/NDBM_File/hints/dynixptx.pl
# On DYNIX/ptx 4.0 (v4.1.3), ndbm is actually contained in the # libc library, and must be explicitly linked against -lc when compiling. $self->{LIBS} = ['-lc'];