nkf.o : nkf.c $(HDRS) $(ruby_headers) \
  $(hdrdir)/ruby/encoding.h \
  $(hdrdir)/ruby/oniguruma.h \
  $(srcdir)/nkf-utf8/nkf.c $(srcdir)/nkf-utf8/nkf.h \
  $(srcdir)/nkf-utf8/utf8tbl.c $(srcdir)/nkf-utf8/utf8tbl.h \
  $(srcdir)/nkf-utf8/config.h