gmp.h can't be found,or is unusable

[Torbjorn Granlund]

Hua Li <privatestuffs at gmail.com> writes:

  I want to install GCC, and have to install GMP and MPFR first.
  
  When I tried to install MPFR, there was an error: "gmp.h can't be
  found,or is unusable". Then I checked GMP-5.0.4 (after
  unpacked/configured), indeed, there is no gmp.h.
  
  How can I generate gmp.h ?
  
Try "make".

-- 
Torbjörn