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diff --git a/i386/configfrag.ac b/i386/configfrag.ac
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+dnl Configure fragment for i386.
+
+dnl Copyright (C) 1999, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
+
+dnl Permission to use, copy, modify and distribute this software and its
+dnl documentation is hereby granted, provided that both the copyright
+dnl notice and this permission notice appear in all copies of the
+dnl software, derivative works or modified versions, and any portions
+dnl thereof, and that both notices appear in supporting documentation.
+dnl
+dnl THE FREE SOFTWARE FOUNDATION ALLOWS FREE USE OF THIS SOFTWARE IN ITS
+dnl "AS IS" CONDITION.  THE FREE SOFTWARE FOUNDATION DISCLAIMS ANY
+dnl LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE
+dnl USE OF THIS SOFTWARE.
+
+#
+# Definitions.
+#
+
+[case $host_cpu in
+  i?86)]
+    AM_CONDITIONAL([HOST_ix86], [true])
+
+    # Some of the i386-specific code checks for these.
+    AC_DEFINE([__ELF__], [1], [__ELF__])
+
+    # Determines the size of the CPU cache line.
+    AC_DEFINE([CPU_L1_SHIFT], [6], [CPU_L1_SHIFT])
+
+    [# Does the architecture provide machine-specific interfaces?
+    mach_machine_routines=1;;
+  *)]
+    AM_CONDITIONAL([HOST_ix86], [false])[;;
+esac
+
+case $host_platform in
+  at)]
+    AM_CONDITIONAL([PLATFORM_at], [true])[;;
+  *)]
+    AM_CONDITIONAL([PLATFORM_at], [false])[;;
+esac
+
+#
+# Formerly in `i386/bogus/'.
+#
+
+case $host_platform:$host_cpu in
+  at:i?86)
+    # should be 4, but we do not support shared IRQ for these
+    ncom=2
+    nlpr=1
+
+    # i386/bogus/platforms.h]
+    AC_DEFINE([AT386], [1], [AT386])[;;
+  xen:i?86)
+    # TODO.  That should probably not be needed.
+    ncom=1
+    # TODO.  That should probably not be needed.
+    # i386/bogus/platforms.h]
+    AC_DEFINE([AT386], [1], [AT386])[;;
+  *)
+    :;;
+esac]
+
+#
+# Options.
+#
+
+# The immediate console, useful for debugging early system
+# initialization.  Disabled by default.
+AC_DEFINE([ENABLE_IMMEDIATE_CONSOLE], [0], [ENABLE_IMMEDIATE_CONSOLE])
+
+AC_ARG_ENABLE([lpr],
+  AS_HELP_STRING([--enable-lpr], [lpr device; on ix86-at enabled by default]))
+[case $host_platform:$host_cpu in
+  at:i?86)
+    case $enable_device_drivers in
+      default)
+        enable_lpr=${enable_lpr-yes};;
+      *)
+        enable_lpr=${enable_lpr-no};;
+    esac;;
+  *)
+    if [ x"$enable_lpr" = xyes ]; then]
+      AC_MSG_ERROR([cannot enable `lpr' in this configuration.])
+    [fi;;
+esac
+if [ x"$enable_lpr" = xyes ]; then]
+  AC_DEFINE([MACH_LPR], [], [lpr device])
+  AM_CONDITIONAL([enable_lpr], [true])
+[else]
+  AM_CONDITIONAL([enable_lpr], [false])
+[fi]
+
+AC_ARG_ENABLE([apic],
+  AS_HELP_STRING([--enable-apic], [LAPIC/IOAPIC support]))
+[if [ x"$enable_apic" = xyes ]; then]
+  AC_DEFINE([APIC], [1], [APIC support])
+  AM_CONDITIONAL([enable_apic], [true])
+[else]
+  AM_CONDITIONAL([enable_apic], [false])
+[fi]
+
+[case $host_platform:$host_cpu in
+  xen:i?86)
+    enable_pae=${enable_pae-yes};;
+  *:i?86)
+    :;;
+  *:x86_64)
+    enable_pae=${enable_pae-yes};;
+  *)
+    if [ x"$enable_pae" = xyes ]; then]
+      AC_MSG_ERROR([can only enable the `PAE' feature on ix86.])
+    [fi;;
+esac]
+
+AC_ARG_WITH([_START_MAP],
+  AS_HELP_STRING([--with-_START_MAP=0x1000000], [specify kernel mapping start address]),
+  [_START_MAP="$withval"], [_START_MAP=0x1000000])
+AC_SUBST(_START_MAP)
+
+dnl Local Variables:
+dnl mode: autoconf
+dnl End: