Help with gfortran

I am new to QNX and did quite a bit of research and found this forum. I am looking to compile fortran code nativly in QNX. I know there is f2c but i am not linking it and prefer doing the compilation natively. I found the package gcc4.2.0 with gfortran in it through your site and it points to to get it. Now my question is what do i do with it. I think this release is already compiled and built for x86 machines running QNX6.3 if i am not mistaking. How do I install it. What am i supposed to do with the contents. Am I supposed to build stuff from or I am just supposed to put the files in certain directories. If so where to I have to put them.

And please forgive my noobness.