Utime failed: Operation not permitted in craft/app/helpers/IOHelper.php on line 1540 I'm trying to install craft, but I have 4 errors like this on the screen:

Utime failed: Operation not permitted in craft/app/helpers/IOHelper.php on line 1540

What are possible causes, and how can I fix it and install properly craft?
It looks like a permissions related issue.  Check the user:group owner of all of the files in the craft/app folder and make sure that they are set to the same user:group that your PHP installation is running as.