diff --git a/scripts/makelst b/scripts/makelst
index 34bd723..4fc80f2 100755
--- a/scripts/makelst
+++ b/scripts/makelst
@@ -1,31 +1,31 @@
-#!/bin/bash
+#!/bin/sh
 # A script to dump mixed source code & assembly
 # with correct relocations from System.map
-# Requires the following lines in Rules.make.
-# Author(s): DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) 
-#            William Stearns <wstearns@pobox.com>
+# Requires the following lines in makefile:
 #%.lst: %.c
 #	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -g -c -o $*.o $<
-#	$(TOPDIR)/scripts/makelst $*.o $(TOPDIR)/System.map $(OBJDUMP)
+#	$(srctree)/scripts/makelst $*.o $(objtree)/System.map $(OBJDUMP)
 #
-#    Copyright (C) 2000 IBM Corporation
-#    Author(s): DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) 
+# Copyright (C) 2000 IBM Corporation
+# Author(s): DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+#            William Stearns <wstearns@pobox.com>
 #
 
-t1=`$3 --syms $1 | grep .text | grep " F " | head -n 1`
+# awk style field access
+field() {
+  shift $1 ; echo $1
+}
+
+t1=`$3 --syms $1 | grep .text | grep -m1 " F "`
 if [ -n "$t1" ]; then
-  t2=`echo $t1 | gawk '{ print $6 }'`
+  t2=`field 6 $t1`
   if [ ! -r $2 ]; then
     echo "No System.map" >&2
-    t7=0
   else
     t3=`grep $t2 $2`
-    t4=`echo $t3 | gawk '{ print $1 }'`
-    t5=`echo $t1 | gawk '{ print $1 }'`
-    t6=`echo $t4 - $t5 | tr a-f A-F`
-    t7=`( echo  ibase=16 ; echo $t6 ) | bc`
+    t4=`field 1 $t3`
+    t5=`field 1 $t1`
+    t6=`printf "%lu" $((0x$t4 - 0x$t5))`
   fi
-else
-  t7=0
 fi
-$3 -r --source --adjust-vma=$t7 $1
+$3 -r --source --adjust-vma=${t6:-0} $1