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* Makefiles

building s/w in different directories
	but sharing the source tree

VPATH in makefiles

config.guess
	uname => Linux (OS name)
	uname -r => 2.4.3-12 (OS release)
	uname -v => OS version
	uname -m => i686 (Arch)

* Installing
want separate install dirs
	ok if /usr/local on separate machines
		not ok if you're using the same dir (/home/USER)
	large packages are better rooted at their own dir
	INSTDIR=$HOME/skey-$UNAME
	(set it in your $PATH .../bin subdir; don't forget MANPATH)

install -c foo -m 755 -s foo /usr/local/bin/foo
	different variants of install: check man pages