If you want to indent this source file, in order to convert the source tree to the used programming style, you should use `make indent' in the base directory. For this to work you need to have `indent' version 2.1.0 or higher in your PATH. GNU indent 2.1.0 is available from all GNU sites, its main ftp site is ftp://ftp.gnu.org/indent/. Or you can download it directly from the webpage of its maintainer at http://www.xs4all.nl/~carlo17/indent/