Another question... ( gluPerspective and gfFrustum)

Hi, I wanted to use glFrustum instead of gluPerspective but I suspect there are some maths to do and I’m sure of mine.

Here is Nehe’s code :
// Calculate The Aspect Ratio Of The Window

How to transform that in a frustum ??

answer to myself:

look here stupid forum user who don’t use the search fonction before posting: