/home/cpanrun/build/5.6.1/bin/perl Build.PL 
Checking whether your kit is complete...
ERROR: Module::Build: Version 0.20 is installed, but we need version >= 0.21
ERRORS/WARNINGS FOUND IN PREREQUISITES.  You may wish to install the versions
 of the modules indicated above before proceeding with this installation.

Looks good
Creating new 'Build' script for 'Tie-CPHash' version '1.03'
/home/cpanrun/build/5.6.1/bin/perl Build
lib/Tie/CPHash.pm -> blib/lib/Tie/CPHash.pm
Manifying blib/lib/Tie/CPHash.pm -> blib/libdoc/Tie::CPHash.3
/home/cpanrun/build/5.6.1/bin/perl Build test
t/00.load...........# Testing Tie::CPHash 1.03
ok
t/10.CPHash.........ok, 4/16 skipped: SCALAR added in Perl 5.8.3
t/pod-coverage......skipped: Test::Pod::Coverage 1.04 required for testing POD coverage
t/pod...............skipped: Test::Pod 1.14 required for testing POD
All tests successful, 2 tests and 4 subtests skipped.
Files=4, Tests=17,  1 wallclock secs ( 0.78 cusr +  0.09 csys =  0.87 CPU)
/home/cpanrun/build/5.6.1/bin/perl Build install
Installing /home/cpanrun/build/5.6.1/lib/site_perl/5.6.1/Tie/CPHash.pm
Installing /home/cpanrun/build/5.6.1/man/man3/Tie::CPHash.3