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The problem ist resolved - i know the workaround, thanks
I have read the scripts and found the phpcmd call under perl.... I don't allow this calls under php, because it could be a security problem. If you want to get your server pci-compliant, you have a lot of disabled functions
What i hope, that you can change the installer and can check, if the option allow_url_open=on is set.
As i am allready said, i know how to work with it, but maybe for other ones there should be integrated installer check.
The question was: If you add these changes (as in the patch above) this work or not??? If yes, i'll add that patch in master. I don't care about your specific environment. 
The patch above allow to enable the allow_url_fopen only for the composer command.
