Does anyone know what this means?

HI! I have a readme that gives the following statement.

Requirements
PHP3 or PHP4: PHP also needs to be compiled with MySQL support;
MySQL (tested with 3.21.x, 3.22.x, 3.23.x and 4.0.x);
A web-browser.

I installed Mysql server 4.1 on my IIS 5.1 and used the defaults, (
Development machine) there is further docs none refer to this specific part.

Do you know what this means?