myscript/bin ..... scripts
myscript/lib ..... modules
myscript/lib/build . for building modules with h2xs
myscript/source .. sourcefiles
myscript/log ..... for logfiles
myscript/doc ..... documentation
myscript/work .... working dir(s)
myscript/result .. output dir
....

##</code><code>##

BEGIN {
  use FindBin ();
  use lib "$FindBin::Bin/../lib";
  require ModulXY;
} # BEGIN