Same error.
Installed last Apache, last MySQL, last PHP. It should not matter, but just for reference, this is on top of Windows XP and
other PHP applications run just fine.
OJS blows; PHP complains, the log file reads:
PHP Fatal error: Cannot redeclare class Locale in D:\path\ojs\classes\i18n\Locale.inc.php on line 28
I began replacing the identifier "Locale" with "Localex" , guessing it seems to be a duplicated identifier.
Seemed to work as far as I got patience to play with (the error moved to other files using 'Locale::something').
By the way: thank you developers for OJS

, but, *please*, provide more detailed information (like PHP required settings)
concerning installation

, or state explicitely that installers are not required to bother with *any* parameters.