The new version of the program is also prepared as described in Chapter 4. This updateable version of the program will never be run. The program must be prepared as updateable to produce the whole-program merged source code of the program, which will be fed to the patch generator. In this example, preparing an updateable vsFTPd version 2.0.5 produces the file vsftpd-2.0.5/vsftpd_comb.c.