tclexecomp won't print anything

I wrapped an entire Tk application with tclexecomp.

It works. Everything works.

Then I have some idea and decide to test something. The story gets
long, but we can shorten it.

Instead of a full-fledged application, only this script is packed:

$ cat p1.tcl
puts "hello"
exit

Yes, that's it.

So I pack it and run it and nothing prints. Why?

(In the slightly longer version of this story, I am trying to puts
the output of [pwd], [glob *], [parray env] and source another .tcl
file.)

--
Luc

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