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my $path;
BEGIN {
...
   $path = "/www/domain/cgi-bin";
}
use lib $path;

use lib do {
   # Code that determines the path and returns it.
   "/www/domain/cgi-bin"
};

sub get_lib_path {
   # Code that determines the path and returns it.
...
}

use lib get_lib_path();

# Hardcoded
use lib "/www/domain/cgi-bin";