Thank you Anonymous Monk!

Apparently the code in lib/jwsDancer.pm contained an error.

With the script as you suggested in bin/myprove.pl I got it to work changing the path slightly (erroneously it went up one directory too far).

use FindBin;
chdir "$FindBin::Bin/.."; # jwsDancer/bin/..
system
  $^X,
  '-S',
  'prove',
  "-I$FindBin::Bin/../lib",
# jwsDancer/bin/../lib
  "-I$FindBin::Bin/../local/lib/perl5",
# jwsDancer/bin/../local/lib/perl5
  @ARGV;
[download]

All tests run smoothly with modules locally installed and a command like: perl bin/myprove.pl -lv t/*

Gert