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AC_SUBST_DIR(VARNAME,
[DIR])
This macro substitutes (with AC_SUBST) VARNAME with the expansion of itself or the DIR variable if specified, taking care of fixing up ${prefix} and such.
Side effect: VARNAME is replaced with the expansion.
AC_SUBST_DIR bases on Alexandre Oliva's AC_DEFINE_DIR macro.
Examples:
AC_SUBST_DIR(DATADIR)
1.3 (last modified: 2003-04-24)
Mathias Hasselmann <mathias.hasselmann@gmx.de>
AC_DEFUN([AC_SUBST_DIR], [
ifelse($2,,,$1="[$]$2")
$1=`(
test "x$prefix" = xNONE && prefix="$ac_default_prefix"
test "x$exec_prefix" = xNONE && exec_prefix="${prefix}"
eval echo \""[$]$1"\"
)`
AC_SUBST($1)
])