I've digged out through the Pov-ray help and found something like this

#ifdef (User_Thing)
  // This section is parsed if the
  // identifier "User_Thing" was
  // previously declared
  object{User_Thing} // invoke identifier
 #else
  // This section is parsed if the
  // identifier "User_Thing" was not
  // previously declared
  box{<0,0,0>,<1,1,1>} // use a default
 #end
  // End of conditional part

is it usefull for the textures replacement?

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