$(top_srcdir)/sntp/scm-rev: FRC.scm-rev $(AM_V_GEN)cd $(top_builddir)/sntp && $(MAKE) $(AM_MAKEFLAGS) check-scm-rev FRC.scm-rev: @: FRC.scm-rev "force" depends on nothing and is not a file, so is \ always out-of-date causing targets which depend on it to also \ be outdated so their rules to fire each time they are built.