This is Perl module Plack::Builder::Conditionals. INSTALLATION Plack::Builder::Conditionals installation is straightforward. If your CPAN shell is set up, you should just be able to do % cpan Plack::Builder::Conditionals Download it, unpack it, then build it as per the usual: % perl Makefile.PL % make && make test Then install it: % make install DOCUMENTATION Plack::Builder::Conditionals documentation is available as in POD. So you can do: % perldoc Plack::Builder::Conditionals to read the documentation online with your favorite pager. Masahiro Nagano