prefix variable

[Rob Benton]

Hey I'm trying to get up to speed on the install variables that autoconf 
uses.  The doc that I have (for ver 2.59) says:

"...
Most of these variables have values that rely on |prefix| or 
|exec_prefix|. It is deliberate that the directory output variables keep 
them unexpanded: typically |@datadir@| will be replaced by 
|${prefix}/share|, not |/usr/local/share"



So is it just understood that I'm supposed to use an assignment like:

"prefix = @prefix@"

In my Makefile.in?  Otherwise I don't see how $(datadir) gets set.
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