CPAN cannot install modules locally

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Hi

I am trying to install MediaWiki::Bot module locally on my server (I am 
not the admin).
I am trying to use cpan command line interface for this.

I used following options before beginning installation:
o conf makepl_args "LIBS=-L/home/foo/local/lib 
INC=-I/home/foo/local/include PREFIX=/home/foo/local/"
o conf commit

It turned out that MediaWiki::Bot requires bunch of other modules that 
cpan tries to install. But I see that many  of them fail test cases 
because they cannot detect each other. For example,

#   Failed test at t/warnings_exist.t line 36.
#          got: 'Base class package "Tree::DAG_Node" is empty.'

Or they are getting incorrect version (possibly the one thats installed 
in /usr/lib/perl)

#.HTML::Entities version 3.28 required--this is only version 1.35 at 
/home/foo/.cpan/build/MediaWiki-Bot-3.4.0-X3wY3E/blib/lib/MediaWiki/Bot.pm 
line 7.

And due to failed test cases cpan does not install anything.

How do I ensure that cpan uses the modules from /home/foo/local ? 
Essentially, I want to override the library preference order. I thought 
I was doing that using the o conf makepl_args option. But apparently it 
is not working.

Any help will be greatly appreciated.

Thanks,
Alok

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