txt2pre = $(PERL) -I lib ./Documentation/txt2pre <$< >$@+ && \
touch -r $< $@+ && mv $@+ $@
txt := INSTALL README COPYING TODO
txt2pre = $(PERL) -I lib ./Documentation/txt2pre <$< >$@+ && \
touch -r $< $@+ && mv $@+ $@
txt := INSTALL README COPYING TODO