diff --git a/bfd/hosts/amix.h b/bfd/hosts/amix.h
index 30a0cf1ac0..8ff179f204 100644
--- a/bfd/hosts/amix.h
+++ b/bfd/hosts/amix.h
@@ -1,11 +1,10 @@
-/* Not sure why this is needed -- Fred Fish put it in */
-#define USG
-
+/* Amiga Unix host system */
 #include <fcntl.h>
 #include <errno.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <utime.h>
 #include <ctype.h>
 #include <string.h>
 #include <sys/file.h>
@@ -16,6 +15,8 @@
 #define SEEK_SET 0
 #define SEEK_CUR 1
 
+#define POSIX_UTIME
+
 extern PROTO(int,  abort,(void));
 extern PROTO(int,  close,(int));
 extern PROTO(void, exit,(int));
diff --git a/bfd/hosts/hp9000.h b/bfd/hosts/hp9000.h
index 249a781cee..cbdb6d1308 100644
--- a/bfd/hosts/hp9000.h
+++ b/bfd/hosts/hp9000.h
@@ -12,11 +12,8 @@
 #define SEEK_SET 0
 #define SEEK_CUR 1
 
-/*
- * Some things that need to be defined in order to make code written for
- * BSD Unix compile under System V ("USG") Unix.  This file should be
- * conditionally included in the source.
- */
+/* Some things that need to be defined in order to make code written for
+   BSD Unix compile under System V Unix.  */
 
 #include <memory.h>
 #define bcmp(b1,b2,len)		memcmp(b1,b2,len)
diff --git a/bfd/hosts/i386v.h b/bfd/hosts/i386v.h
index f1018c6711..fe6e2fb74a 100644
--- a/bfd/hosts/i386v.h
+++ b/bfd/hosts/i386v.h
@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/utime.h>
 #include <ctype.h>
 #include <string.h>
 #include <sys/file.h>
@@ -12,11 +13,10 @@
 #define SEEK_SET 0
 #define SEEK_CUR 1
 
-/*
- * Some things that need to be defined in order to make code written for
- * BSD Unix compile under System V ("USG") Unix.  This file should be
- * conditionally included in the source.
- */
+#define	POSIX_UTIME
+
+/* Some things that need to be defined in order to make code written for
+   BSD Unix compile under System V Unix.  */
 
 #include <memory.h>
 #define bcmp(b1,b2,len)		memcmp(b1,b2,len)
diff --git a/bfd/hosts/rs6000.h b/bfd/hosts/rs6000.h
index b8f0788704..4fb70e8f54 100644
--- a/bfd/hosts/rs6000.h
+++ b/bfd/hosts/rs6000.h
@@ -6,6 +6,8 @@
 #include <ctype.h>
 #include <string.h>
 #include <sys/file.h>
+#include <stdlib.h>		/* for malloc() */
+
 #ifndef O_ACCMODE
 #define O_ACCMODE (O_RDONLY | O_WRONLY | O_RDWR)
 #endif