When you look at the options for a particular file, whether it is a source file or build file, you see only the options that have been specifically set for that file. You do not see the options that the file inherits from the build files of its parents. Before setting an option for a specific file, you probably want to see whether that option is already being inherited from a parent.
To see the inherited value of the option, click Merge in the Options dialog box, or click (
) in the main Builder window. You cannot edit the options while you are looking at them in merged mode. If you see an option you want to change, first click Unmerge or (
(#) then edit the option.