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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)
])