Description files can use a special syntax to determine the drive, path, base name, and extension of the first dependent file in a description block. This syntax is called the "extmake" syntax.
The characters, %s, represent the complete file specification of the first dependent file. Various parts of the file specification are represented using the syntax
%|partsF
where <parts> is a combination of the following letters:
d
For example, to specify the drive and path name of the first dependent file in a description block, use:
%|dpF
The percent symbol (%) is a replacement in DOS and OS/2 command lines. To use the percent symbol in command-line arguments, use a double percent (%%).