mod_perl is 1.x, mod_perl2 is 2.x http://search.cpan.org/~gozer/mod_perl-2.0.4/lib/mod_perl2.pm, search.cpan.org might confuse based on distribution name, but CPAN doesn't 
$ cpanp l mod_perl mod_perl2
[MSG] Checking if source files are up to date
Details for 'mod_perl'
Author                   Philippe M. Chiasson (gozer@cpan.org)        
Description              None given                                   
Development Stage        Released                                     
Interface Style          Object oriented using blessed references and/
+or inheritance
Language Used            C and perl, a C compiler will be needed      
Package                  mod_perl-1.31.tar.gz                         
Public License           Unknown                                      
Support Level            Mailing-list                                 
Version on CPAN          1.31                                         
Contains:                Apache                                       
+ 1.27      
*snip**snip**snip*
                         mod_perl                                     
+ 1.31      

Details for 'mod_perl2'
Author                   Philippe M. Chiasson (gozer@cpan.org)        
Description              None given                                   
Development Stage        Unknown                                      
Interface Style          Unknown                                      
Language Used            Unknown                                      
Package                  mod_perl-2.0.4.tar.gz                        
Public License           Unknown                                      
Support Level            Unknown                                      
Version on CPAN          2.000004                                     
Contains:                APR                                          
+ 0.009000  
*snip**snip**snip*

                         mod_perl2                                    
+ 2.000004  




$ cpan -D mod_perl mod_perl2
CPAN: Storable loaded ok (v2.21)
Going to read '*snip*\.cpan\Metadata'
  Database was generated on Mon, 09 Aug 2010 00:29:58 GMT
mod_perl
----------------------------------------------------------------------
+---
        (no description)
        G/GO/GOZER/mod_perl-1.31.tar.gz
        Installed:
        CPAN:      1.31  Not up to date
        Philippe M. Chiasson (GOZER)
        gozer@cpan.org

mod_perl2
----------------------------------------------------------------------
+---
        (no description)
        G/GO/GOZER/mod_perl-2.0.4.tar.gz
        Installed:
        CPAN:      2.000004  Not up to date
        Philippe M. Chiasson (GOZER)
        gozer@cpan.org


$

[download]

In reply to Re^4: mod_perl installation - missing apache src by Anonymous Monk
in thread mod_perl installation - missing apache src by ARiccela

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