diff --git a/vblade/aoe.c b/vblade/aoe.c
index 168f923..e8dd800 100644
--- a/vblade/aoe.c
+++ b/vblade/aoe.c
@@ -18,6 +18,18 @@ enum {
 	Alen= 6,
 };
 
+
+int	shelf;
+int	slot;
+ulong	aoetag;
+uchar	mac[6];
+int	bfd;		// block file descriptor
+int	sfd;		// socket file descriptor
+vlong	size;		// size of vblade
+vlong	offset;
+char	*progname;
+char	serial[Nserial+1];
+
 uchar masks[Nmasks*Alen];
 int nmasks;
 uchar srr[Nsrr*Alen];
diff --git a/vblade/ata.c b/vblade/ata.c
index a53310f..18ad6f8 100644
--- a/vblade/ata.c
+++ b/vblade/ata.c
@@ -6,6 +6,12 @@
 #include "dat.h"
 #include "fns.h"
 
+extern vlong	size;
+extern vlong	offset;
+extern int	bfd;
+extern int	sfd;
+extern char	serial[];
+
 enum {
 	// err bits
 	UNC =	1<<6,
diff --git a/vblade/bpf.c b/vblade/bpf.c
index 2527348..0eab1d9 100644
--- a/vblade/bpf.c
+++ b/vblade/bpf.c
@@ -8,6 +8,9 @@
 #include "dat.h"
 #include "fns.h"
 
+extern int	shelf;
+extern int	slot;
+
 struct bpf_insn {
 	ushort code;
 	uchar jt;
diff --git a/vblade/dat.h b/vblade/dat.h
index ddd17f6..e9d037f 100644
--- a/vblade/dat.h
+++ b/vblade/dat.h
@@ -162,14 +162,3 @@ enum {
 
 	Nserial= 20,
 };
-
-int	shelf, slot;
-ulong	aoetag;
-uchar	mac[6];
-int	bfd;		// block file descriptor
-int	sfd;		// socket file descriptor
-vlong	size;		// size of vblade
-vlong	offset;
-char	*progname;
-char	serial[Nserial+1];
-
diff --git a/vblade/freebsd.c b/vblade/freebsd.c
index 6b657c0..6e864a5 100644
--- a/vblade/freebsd.c
+++ b/vblade/freebsd.c
@@ -41,6 +41,9 @@
 static uchar *pktbuf = NULL;
 static int pktbufsz = 0;
 
+extern int	shelf;
+extern int	slot;
+
 int
 dial(char *eth, int bufcnt)
 {
diff --git a/vblade/linux.c b/vblade/linux.c
index a8fb3c7..deb5ec3 100644
--- a/vblade/linux.c
+++ b/vblade/linux.c
@@ -31,7 +31,8 @@
 int	getindx(int, char *);
 int	getea(int, char *, uchar *);
 
-
+extern int	shelf;
+extern int	slot;
 
 int
 dial(char *eth, int bufcnt)		// get us a raw connection to an interface