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From Issac Goldstand <mar...@beamartyr.net>
Subject Re: Rusty perl question
Date Mon, 13 Nov 2006 09:03:36 GMT
Is this what you mean?

  use constant MP_GEN => $ENV{MOD_PERL}
      ? { ( exists $ENV{MOD_PERL_API_VERSION} and 
            $ENV{MOD_PERL_API_VERSION} >= 2 ) ? 2 : 1 }
      : 0;

It sets the constant |MP_GEN| to 0 if mod_perl is not available, to 1 if 
running under mod_perl 1.0 and 2 for mod_perl 2.0.

Then you can

    require foo if (MP_GEN == 2);

or whatever.

(See 
http://perl.apache.org/docs/2.0/user/porting/porting.html#Porting_a_Module_to_Run_under_both_mod_perl_2_0_and_mod_perl_1_0)

  Issac

Patrick Galbraith wrote:
> Hi all,
>
> I used to know the trick, I think, but can't remember. I want to code 
> my application to be smart about whether it's on a system that can use 
> mod_perl2/apreq, or if I have to use CGI. I 've code my app to use CGI 
> successfully, but would like to keep the code that I worked to get 
> apreq working as well. I would like for my application to be smart 
> enough to say use apreq if it's there, or use CGI if it isn't. What's 
> the magical trick to toggle the 'use libfoo' or 'use libfee'? Kindof 
> like #ifdefs in C...
>
> Thanks!
>
> Patrick

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