message: fix missing fortran compiler define
diff: @@ -347,6 +347,8 @@ class Conduit(CMakePackage):
  cfg.write("# fortran compiler used by spack\n")
  if "+fortran" in spec:
  cfg.write(cmake_cache_entry("ENABLE_FORTRAN", "ON"))
  + cfg.write(cmake_cache_entry("CMAKE_Fortran_COMPILER",
  + f_compiler)
  else:
  cfg.write(cmake_cache_entry("ENABLE_FORTRAN", "OFF"))
  