Here is the result I get when using cpan2rpm (tested both 2.026 & 2.027) :
# cpan2rpm http://www.cpan.org/authors/id/C/CA/CAPTTOFU/DBD-mysql-2.9007.tar.gz

-- cpan2rpm - Ver: 2.027 --
Signatures not set up
Upgrade check
Fetch: HTTP
-- module: http://www.cpan.org/authors/id/C/CA/CAPTTOFU/DBD-mysql-2.9007.tar.gz --
Metadata retrieval
Tarball extraction: [/usr/src/redhat/SOURCES/DBD-mysql-2.9007.tar.gz]
... and nothing more happens, the program exits without error & without creating rpms, srpms or spec files.
Tested on 3 machines, 2 different OS (RHEL3 and redhat9) with perl v5.8.0.

I'm sorry if I missed something but I really don't find any explanation nor on the website nor on google.
Thanks in advance.