Description of Problem:
ndbm.h resides in /usr/include/db1 and belongs to the db1-devel package,
whereas libndbm.so is a symlink to libdb2.so and belongs to the db2-devel
This induces unnecessary build dependencies (and potential problems)
for perl and other sources that include ndbm.h and link against -lndbm.
The problem no more exist since db4.