include - Perl : constant & require -

i have config file (config.pl) constants :

#!/usr/bin/perl use strict; use warnings; use net::domain qw(hostname hostfqdn hostdomain domainname);  use constant url => "http://".domainname()."/"; use constant cgibin => url."cgi-bin/"; use constant css => url."html/css/"; use constant ressources => url."html/ressources/"; ... 

and use these constants in index.pl, index.pl starts :

#!/usr/bin/perl -w use strict; use cgi; require "config.pl"; 

how use url, cgi... in index.pl ?
thanks,
bye

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edit
found solution :
config.pm

#!/usr/bin/perl package config; use strict; use warnings; use net::domain qw(hostname hostfqdn hostdomain domainname);  use constant url => "http://".domainname()."/"; use constant cgibin => url."cgi-bin/"; 1; 

index.pl

begin {     require "config.pm"; } print config::url; 

end

what want here setup perl module can export from.

place following 'myconfig.pm':

#!/usr/bin/perl package myconfig; use strict; use warnings; use net::domain qw(hostname hostfqdn hostdomain domainname);  use constant url => "http://".domainname()."/"; use constant cgibin => url."cgi-bin/"; use constant css => url."html/css/"; use constant ressources => url."html/ressources/";  require exporter; our @isa = 'exporter'; our @export = qw(hostname hostfqdn hostdomain domainname url cgibin css ressources); 

and use it:

use myconfig;  # means begin {require 'myconfig.pm'; myconfig->import}  

by setting @isa exporter in myconfig package, setup package inherit exporter. exporter provides import method implicitly called use myconfig; line. variable @export contains list of names exporter should import default. there many other options available in perl's documentation , in documentation exporter