I have problem following the nehe opengl tutorial i use delphi 6 update pack 2 and the function gluBuild2DMipmaps declaration in the Opengl unit is different from the one in the tutorials so i guess it is not complete so i used jedi opengl unit and i found the function matched but another error appear the unit did not have a declatation for the TGLArrayf4 at all so from where i can download a complete opengl unit to follow the tutorials thanks

You can download an OpenGL 1.2 unit from my site:
http://jijigaga.com/qrli/en.htm

There''s also an OpenGL widget for VCL/CLX.

TGLArray4f is just a helper type.

TGLArray4f = array[0..3] of Single;

You can change it to anything equivalent. If you use the Math3D unit or other vector math unit, replace it with TVector4f.

Thanks "qingrui" it work