* HW3

shell scripts to test for features
- collecting info in config.h
- testing headers
- testing functions
- testing C features
- testing CPP features
- temp files

* Testing features

testing features, eg getitimer() and time headers
wrapper shell script:
        if [ -f /usr/include/...]; then
                gcc -DFOO_BAR
        fi
how can you find out if you can include both
        time.h and sys/time.h
	what if you cannot include both?
what about systems that have neither?

how to test if crypt() exists in libc or libcrypt.  Updated LDFLAGS.
what kinds of tests need
	shell scripting?
	cpp?
	ccom?
	ld?
	run ./a.out?

------------------------------------------------------------------------------