anchor.diff:  === Definition
   
   Spores are defined using a Moss structure with the `SPORE/` prefix.
  -Configuration options are present as structure argument `$1`.
  +The structure instance name is present as argument `$1`.
   
   === Specialization
   
  
positive.code:   # mylib is always linked because it is required by main
    libraries: mylib
    # No dependency if we are using a prebuilt library already in the path
    depends: $(if $($1.use_mylib_source), mylib)
  endef
  ----
  
  
negative.code: [source,makefile]
  ----
  define SPORE/util
    source: $(if $($1.option.use_fpu), fpu.c) common.c
    lang.c.defines: $(if $($1.option.use_fpu), USE_FPU)
  endef
  ----
  
  