This is the same as for the Win32 platform.
make sure your phpinfo script is written correctly:
<head></head>
<body>
<?php
phpinfo ();
?>
</body>
i don't know what the other variables are for linux, so... if this does not work, then you should rm -r (or whatever the redhat commands are) the whole package and try to redo it... compile it with gcc.
i opted to do it on the win32 because that is the platform i can use at home, on my external web server, and on my internal webservers... i do have it installed on a solaris machine too, but that is only a test machine...
good luck!
:wq