• Integrate build/man touchups from Debian.
• Add fix from Fedora for handling of 0 byte files.
• Pull in POSIX standard headers for prototypes (stdlib,string,unistd).
• Replace rindex() with strrchr().
• Don't set CC by default in Makefile.def and add CFLAGS/CPPFLAGS/LDFLAGS where appropriate by default.
• Add support for DESTDIR to the install target.