code: def _make_compiler_include(precompile, extralinks):
      
      base = """ifeq ($(FAM),ifort)
    include {2}/Makefile.ifort{0}{3}
  else
  ifeq ($(FAM),gfortran)
    include {2}/Makefile.gfortran{1}{3}
  else
    include Makefile.error
  endif
  endif"""
      if extralinks is not None and len(extralinks) > 0:
          from os import path
          libs = []
          for i, link in enumerate(extralinks):
              #We can only include *directories* for the -I specification.
              if path.isdir(link):
                  libs.append("-I$(LBD{0:d})".format(i))
          exlinks = "\n  FFLAGS += {}".format(' '.join(libs))
      else:
          exlinks = ""
          
      #We need to see whether to include the pre-compiler directive or not.    
      if precompile:
          insert = ["\n  FFLAGS += -fpp -save-temps -heap-arrays", "\n  FFLAGS += -cpp",
                    get_fortpy_templates(), exlinks]
          return base.format(*insert)
      else:
          return base.format("", "", get_fortpy_templates(), exlinks)
docs: Returns the include statement for the compiler to use.