Subject: | "libwww" specified in TEST_REQUIRES |
"libwww" should be written either "LWP" or "LWP::UserAgent" here:
https://metacpan.org/source/DMOR/Net-Hadoop-WebHDFS-LWP-0.005/Makefile.PL#L40
Otherwise CPAN.pm complains:
Running test for module 'libwww'
The module libwww isn't available on CPAN.
Either the module has not yet been uploaded to CPAN, or it is
temporary unavailable. Please contact the author to find out
more about the status. Try 'i libwww'.