how do I install i386 library

[O. Faeroe]

Hi,

I am trying to compile and link a program which includes

    #include <i386/fpu_control.h>

and uses the function __setfpucw.

But /usr/include does not contain the directory i386 and
Iink the program it says

    undefined reference to `__setfpucw'

and gives a link-error.

The /usr/include library does contain a file calles fpu_control.h but
this header does not contain the specific function.

How do I install the i386 library ?