Unix Makefile: Some sed implementation truncate long lines. Use perl instead.

depend:

	@: {- output_off() if $disabled{makedepend}; "" -}

	@if egrep "^# DO NOT DELETE THIS LINE" Makefile >/dev/null && [ -z "`find $(DEPS) -newer Makefile 2>/dev/null; exit 0`" ]; then :; else \

	  ( sed -e '/^# DO NOT DELETE THIS LINE.*/,$$d' < Makefile; \

	  ( $(PERL) -pe 'exit 0 if /^# DO NOT DELETE THIS LINE.*/' < Makefile; \

	    echo '# DO NOT DELETE THIS LINE -- make depend depends on it.'; \

	    echo; \

	    for f in $(DEPS); do \