C:\Users\Moez1>cpanm Math::Pari --prompt
Set up gcc environment - gcc.exe (rubenvb-4.5.4) 4.5.4
--> Working on Math::Pari
Fetching http://www.cpan.org/authors/id/I/IL/ILYAZ/modules/Math-Pari-2.01080605.tar.gz ... OK
Configuring Math-Pari-2.01080605 ... OK
Building and testing Math-Pari-2.01080605 ... Building Math-Pari-2.01080605 failed.
You can s)kip, r)etry, e)xamine build log, or l)ook ? [s] e
FAIL
! You don't seem to have a PAGER :/
Building Math-Pari-2.01080605 failed.
You can s)kip, r)etry, e)xamine build log, or l)ook ? [s] l
Entering C:/.cpanm/work/1375113149.2244/Math-Pari-2.01080605 with C:\Windows\system32\cmd.exe
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.