Upload - Unknown PHP upload error code

[Alex_5252]

I'm having issues when uploading on my Coppermine driven gallery http://foto.lo.5252.ru/
When using http uploads and the suggested settings for upload troubleshooting in place, I get the error message

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Unknown PHP upload error code.

Here's the test user account data:
    Username: tester
    Password: tester

I have been using the image taken from foto.lo.5252.ru/zzzpg.jpg as an example to test with.

Search the forums of similar cases have not found.

I have no idea what else to do.
Thanks in advance for your suggestions

[Alex_5252]

OS Gentoo.
Error found, variable upload_tmp_dir has not been defined.

/etc/php/apache2-php5.3/php.ini:

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; Temporary directory for HTTP uploaded files (will use system default if not
; specified).
; http://php.net/upload-tmp-dir
;upload_tmp_dir =
upload_tmp_dir = /tmp


Thanks for you software for gallery!