[dmathis@ear dmathis]$ cat test.pl
#!/usr/bin/perl -w

use DB_File;

[dmathis@ear dmathis]$ ./test.pl

Can't load '/usr/lib64/perl5/5.8.0/x86_64-linux-thread-multi/auto/DB_File/DB_File.so' for module DB_File: libdb-4.7.so: cannot open shared object file: No such file or directory at /usr/lib64/perl5/5.8.0/x86_64-linux-thread-multi/XSLoader.pm line 83.
 at /usr/lib64/perl5/5.8.0/x86_64-linux-thread-multi/DB_File.pm line 252

[dmathis@ear ircsearch]$ locate DB_File.so | grep -v dmathis; locate libdb-4.7.so | grep -v dmathis
/usr/lib64/perl5/5.8.0/x86_64-linux-thread-multi/auto/DB_File/DB_File.so
/usr/local/BerkeleyDB.4.7/lib/libdb-4.7.so