install_data:
@list='$(DATAFILES)'; for p in $$list; do \
if test ! -s $(top_builddir)/$(program_dir)/$$p; then \
- cp -f $(top_srcdir)/$(program_dir)/$$p $(top_builddir)/$(program_dir)/$$p; \
+ cp -pRf $(top_srcdir)/$(program_dir)/$$p $(top_builddir)/$(program_dir)/$$p; \
fi; \
done