It is not needed at all. The attempt to include non-existent or
outdated .d files instructs make to rebuild them.
tarball_delete := $(addprefix $(tarball_pfx)/, web .gitignore)
tarball := $(tarball_pfx).tar.bz2
-.PHONY: dep all clean clean2 distclean maintainer-clean install man tarball
-all: dep $(prefixed_executables) $(man_pages)
-dep: $(deps)
+.PHONY: all clean clean2 distclean maintainer-clean install man tarball
+all: $(prefixed_executables) $(man_pages)
man: $(man_pages)
tarball: $(tarball)