$NetBSD: patch-ai,v 1.3 2023/02/25 17:58:39 ryoon Exp $

--- config/_ml-build.orig	2022-07-28 04:55:45.000000000 +0000
+++ config/_ml-build
@@ -6,6 +6,8 @@
 # usage: ml-build [-S setup] root-group [main-function [heapfile]]
 #
 
+SMLNJ_HOME="${SMLNJ_HOME:-@SML_BASE@}"
+
 if [ x${SMLNJ_HOME} = x ] ; then
     BIN_DIR="@BINDIR@"
     LIB_DIR="@LIBDIR@"