CPAN.pm: Going to build C/CH/CHIPT/Math-GMP-2.04.tar.gz
  
      Checking if your kit is complete...
      Looks good
----> Note (probably harmless): No library found for -lgmp  
      Writing Makefile for Math::GMP

##</code><code>##

  GMP.xs:4:17: gmp.h: No such file or directory
  GMP.c: In function `XS_Math__GMP_new_from_scalar':
  GMP.c:99: error: `mpz_t' undeclared (first use in this function)
  GMP.c:99: error: (Each undeclared identifier is reported only once
  GMP.c:99: error: for each function it appears in.)
  GMP.c:99: error: `RETVAL' undeclared (first use in this function)
  GMP.c: In function `XS_Math__GMP_new_from_scalar_with_base':
  GMP.c:121: error: `mpz_t' undeclared (first use in this function)
  GMP.c:121: error: `RETVAL' undeclared (first use in this function)

  [snip 100+ more lines of error messages]

  make: *** [GMP.o] Error 1
    /usr/bin/make  -- NOT OK
  Running make test
    Can't test without successful make
  Running make install
    make had returned bad status, install seems impossible
  Failed during this command:
    CHIPT/Math-GMP-2.04.tar.gz                   : make NO

##</code><code>##

  ld: /usr/local/lib/libgmp.a(mode1o.o) has local relocation entries in
  non-writable section (__TEXT,__text)