This patch enables the switching of configuration files between Config_heavy.pl and
{PERL_ARCHLIB}/Config_heavy.pl by setting the environment variables
PERL_ARCHLIB - the later containing settings for the target while
the former contains those for the host. This will allow cpan.bbclass
to use the settings appropriate for the native and/or target builds
as required. This also disables the use of the cache since the cached
values would be valid for the host only.

--- perl-5.8.8/configpm	2007/04/30 03:10:43	1.1
+++ perl-5.8.8/configpm	2007/04/30 03:11:56
@@ -374,7 +374,7 @@
     my($self, $key) = @_;
 
     # check for cached value (which may be undef so we use exists not defined)
-    return $self->{$key} if exists $self->{$key};
+    #return $self->{$key} if exists $self->{$key};
 
     return $self->fetch_string($key);
 }
@@ -530,7 +530,12 @@
 sub DESTROY { }
 
 sub AUTOLOAD {
-    require 'Config_heavy.pl';
+    my $cfgfile = 'Config_heavy.pl';
+    if (defined $ENV{PERL_ARCHLIB} )
+    {
+        $cfgfile = "$ENV{PERL_ARCHLIB}/Config_heavy.pl";
+    }
+    require $cfgfile;
     goto \&launcher unless $Config::AUTOLOAD =~ /launcher$/;
     die "&Config::AUTOLOAD failed on $Config::AUTOLOAD";
 }