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Variable Substitution
Configuring all these variables in configure.in is one thing. But they have to passed to the Makefile ultimately.
This is done using AC_SUBST.
HTML_DIR=/tmp/html AC_SUBST(HMTL_DIR) |
This fragment will replace all occurences of @HTML_DIR@ in any Makefile.am with the value of the HTML_DIR variable that is computed in the configure script.
Note
If a variable's contents are empty when it is substituted, the empty string will be used as the value. This can be used to effect conditional compilation, amongst other things.