--- Gnu-Mach/i386/configfrag.ac	2020/09/02 04:51:25	1.1.1.2
+++ Gnu-Mach/i386/configfrag.ac	2020/09/02 04:53:31	1.1.1.3
@@ -119,6 +119,11 @@ if [ x"$enable_pae" = xyes ]; then]
 [else]
   AM_CONDITIONAL([enable_pae], [false])
 [fi]
+
+AC_ARG_WITH([_START_MAP],
+  AS_HELP_STRING([--with-_START_MAP=0x1000000], [specify kernel mapping start address]),
+  [_START_MAP="$withval"], [_START_MAP=0x1000000])
+AC_SUBST(_START_MAP)
 
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