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--- a/fdisklabel.c
+++ b/fdisklabel.c
@@ -72,7 +72,7 @@
 static int bsd_readlabel  (struct partition *p, struct disklabel *d);
 static int bsd_writelabel (struct partition *p, struct disklabel *d);
 static void sync_disks (void);
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
 static int bsd_translate_fstype (int linux_type);
 static void bsd_link_part (void);
 #endif
@@ -82,7 +82,7 @@
 
 static struct disklabel bsd_dlabel;
 static char buffer[BSD_BBSIZE];
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
 static struct partition *bsd_part;
 static int bsd_part_index;
 #endif
@@ -99,13 +99,13 @@
 	"   n   add a new BSD partition\n"
 	"   p   print BSD partition table\n"
 	"   q   quit without saving changes\n"
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
 	"   r   return to main menu\n"
 #endif
 	"   s   show complete disklabel\n"
 	"   t   change a partition's filesystem id\n"
 	"   w   write disklabel to disk\n"
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
 	"   x   link BSD partition to non-BSD partition"
 #endif
 	);
@@ -114,7 +114,7 @@
 void
 bselect (void)
 {
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   int t;
 
   for (t=0; t<4; t++)
@@ -185,7 +185,7 @@
       case 'w':
 	bsd_write_disklabel ();
 	break;
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
       case 'r':
 	return;
       case 'x':
@@ -223,7 +223,7 @@
   if (!bsd_check_new_partition (&i))
     return;
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   begin = bsd_part -> start_sect;
   end = begin + bsd_part -> nr_sects - 1;
 #elif defined (__alpha__) || defined (__powerpc__)
@@ -257,7 +257,7 @@
 
   if (show_all)
   {
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
     fprintf(f, "# %s%d:\n", disk_device, bsd_part_index+1);
 #elif defined (__alpha__) || defined (__powerpc__)
     fprintf(f, "# %s:\n", disk_device);
@@ -352,7 +352,7 @@
 static void
 bsd_write_disklabel (void)
 {
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   printf ("Writing disklabel to %s%d.\n", disk_device, bsd_part_index+1);
   bsd_writelabel (bsd_part, &bsd_dlabel);
 #elif defined (__alpha__) || defined (__powerpc__)
@@ -366,7 +366,7 @@
 {
   char c;
 
-#if defined (i386)
+#if defined (i386) || defined(__amd64)
   fprintf (stderr, "%s%d contains no disklabel.\n",
 	   disk_device, bsd_part_index+1);
 #elif defined (__alpha__) || defined (__powerpc__)
@@ -376,7 +376,7 @@
   while (1)
     if ((c = tolower (read_char ("Do you want to create a disklabel? (y/n) "))) == 'y')
     {
-#if defined (i386)
+#if defined (i386) || defined(__amd64)
       if (bsd_initlabel (bsd_part, &bsd_dlabel, bsd_part_index) == 1)
 #elif defined (__alpha__) || defined (__powerpc__) || defined (__mc68000__)
       if (bsd_initlabel (NULL, &bsd_dlabel, 0) == 1)
@@ -507,7 +507,7 @@
 
   bcopy (&dl, d, sizeof (struct disklabel));
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   sector = bsd_part -> start_sect;
 #elif defined (__powerpc__)
   sector = 0;
@@ -521,7 +521,7 @@
   if (BSD_BBSIZE != write (fd, buffer, BSD_BBSIZE))
     fatal (unable_to_write);
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   printf ("Bootstrap installed on %s%d.\n", disk_device, bsd_part_index+1);
 #elif defined (__alpha__) || defined (__powerpc__)
   printf ("Bootstrap installed on %s.\n", disk_device);
@@ -625,7 +625,7 @@
   d -> d_subtype = BSD_DSTYPE_INDOSPART & pindex;
 #endif
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   d -> d_flags = BSD_D_DOSPART;
 #else
   d -> d_flags = 0;
@@ -648,7 +648,7 @@
   d -> d_bbsize = BSD_BBSIZE;
   d -> d_sbsize = BSD_SBSIZE;
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   d -> d_npartitions = 4;
   pp = &d -> d_partitions[2]; /* Partition C should be the NetBSD partition */
   pp -> p_offset = p -> start_sect;
@@ -674,7 +674,7 @@
 {
   int t, sector;
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   sector = p -> start_sect;
 #elif defined (__alpha__) || defined (__powerpc__)
   sector = 0;
@@ -708,7 +708,7 @@
 {
   int sector;
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
   sector = p -> start_sect + BSD_LABELSECTOR;
 #elif defined (__alpha__) || defined (__powerpc__)
   sector = BSD_LABELSECTOR;
@@ -749,7 +749,7 @@
   sleep (4);
 }
 
-#if defined (i386)
+#if defined (i386) || defined (__amd64)
 static int
 bsd_translate_fstype (int linux_type)
 {
--- a/fdisklabel.h
+++ b/fdisklabel.h
@@ -35,7 +35,7 @@
 #define	BSD_MAXPARTITIONS 8
 #define BSD_LINUX_BOOTDIR "/usr/ucb/mdec"
 
-#if defined (i386)
+#if defined (i386) || defined(__amd64)
 #define BSD_LABELSECTOR   1
 #define BSD_LABELOFFSET   0
 #define	BSD_BBSIZE        8192		/* size of boot area, with label */
--- a/kernel-defs.h
+++ b/kernel-defs.h
@@ -15,8 +15,14 @@
 /* from asm/ioctl.h */
 #define _IOC_NRBITS	8
 #define _IOC_TYPEBITS	8
+
+#ifndef _IOC_SIZEBITS
 #define _IOC_SIZEBITS	13
+#endif
+
+#ifndef _IOC_DIRBITS
 #define _IOC_DIRBITS	3
+#endif
 
 #define _IOC_NRMASK	((1 << _IOC_NRBITS)-1)
 #define _IOC_TYPEMASK	((1 << _IOC_TYPEBITS)-1)