I know you said you don't want to modify your source, but to gleen from your statement about 5.0. To be backwards compatible with it, and perfectly compatible with current versions: 
sub BEGIN
{
  push @INC, "/path/to/your/modules";
}

[download]

In reply to Re^3: Construction of @INC by different versions of perl by blueAdept
in thread Construction of @INC by different versions of perl by muntfish

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