Hi, I'm compiling certain extensions for PHP on dreamhost PS server. I got an error and found that it happens when php4 headers are used instead of php5 headers.

running phpinfo shows the server runs php5. however php-v on the command line gives php4.

How can I make the compilation use php5 instead of php4 on my server? Is there an environment variable of some kind and if so how can I change it (new to linux)

Thanks