acinclude.m4

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)
])