Portability and build improvements:
* Give install the '-c' flag (otherwise some delete the original !).
* Do not remove top-level Makefile on `make clean'.
* Don't complain so much about poll(2) tests if not available.
* Do not give -u 0 -g 0 options to install.
Portability and build improvements:
* Give install the '-c' flag (otherwise some delete the original !).
* Do not remove top-level Makefile on `make clean'.
* Don't complain so much about poll(2) tests if not available.
* Do not give -u 0 -g 0 options to install.