fenv.h not in standard location

[Michael Neumann]

Hi,

I can find fenv.h here:

  /usr/src/lib/libm/arch/i386/fenv.h

but not in /usr/include. The same is true
for the manpages which are here:

  /usr/src/lib/libm/man

But again not in standard locations.

So, programs can't use fenv.h without knowing the exact directory. 
Is there a reason why this is the case?

Regards,

  Michael