Call Time Pass By error

[Bedlore]

Hi I am upgrading from 4.2.1b to 4.5. During the pre-flight check I get this:

############
Detected Settings Show Detected Settings
Minimum PHP Version Unsupported PHP Version Installed: ( ver 4.4.2-1+b1 )
XML Parsing OK
cURL Module Not found: Sugar Scheduler will run with limited functionality.
MBStrings Module OK
IMAP Module Not found: InboundEmail and Campaigns (Email) require the IMAP libraries. Neither will be functional.
PHP Setting: Safe Mode OK
PHP Setting: Call Time Pass By Reference Allow Call Time Pass Reference is Off (please enable in php.ini)
PHP Setting: Memory Limit OK (Unlimited)
Location of php.ini /etc/php4/apache/php.ini
############

Although it says my PHP version is unsupported it is green. The "Call Time Pass By Reference" is red, I have checked my php.ini and it is switched on, does 4.5 only support php5? I was unable to find documentation on that.

Thanks
Brendan

[Bedlore]

Detected Settings Show Detected Settings
Minimum PHP Version Unsupported PHP Version Installed: ( ver 4.4.2-1+b1 ) <-- in green
XML Parsing OK
cURL Module Not found: Sugar Scheduler will run with limited functionality.
MBStrings Module OK
IMAP Module Not found: InboundEmail and Campaigns (Email) require the IMAP libraries. Neither will be functional.
PHP Setting: Safe Mode OK
PHP Setting: Call Time Pass By Reference Allow Call Time Pass Reference is Off (please enable in php.ini)
PHP Setting: Memory Limit OK (Unlimited)
Location of php.ini /etc/php4/apache/php.ini

I assume its the Call Time Pass By error preventing me from upgrading, can someone please assist or tell me if 4.5.0 only supports php5? I couldn't find requirements outlining this.