diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap/drivers/Makefile
--- a/tools/blktap/drivers/Makefile	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap/drivers/Makefile	Mon Jan 11 15:53:25 2010 +0100
@@ -23,7 +23,15 @@
 $(warning === libgcrypt not installed: falling back to libcrypto ===)
 endif
 
-LDFLAGS_blktapctrl := $(LDFLAGS_libxenctrl) $(LDFLAGS_libxenstore) $(MEMSHR_DIR)/libmemshr.a -L../lib -lblktap -lrt -lm
+ifeq ($(CONFIG_Linux), y)
+CFLAGS += -DMEMSHR
+MEMSHRLIBS := $(MEMSHR_DIR)/libmemshr.a
+endif
+ifeq ($(CONFIG_NetBSD), y)
+MEMSHRLIBS :=
+endif
+
+LDFLAGS_blktapctrl := $(LDFLAGS_libxenctrl) $(LDFLAGS_libxenstore) $(MEMSHRLIBS) -L../lib -lblktap -lrt -lm
 LDFLAGS_img := $(LIBAIO_DIR)/libaio.a $(CRYPT_LIB) -lpthread -lz
 
 BLK-OBJS-y  := block-aio.o
diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap/drivers/blktapctrl.c
--- a/tools/blktap/drivers/blktapctrl.c	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap/drivers/blktapctrl.c	Mon Jan 11 15:53:25 2010 +0100
@@ -859,7 +859,9 @@
 		goto open_failed;
 	}
 
-    memshr_daemon_initialize();
+#ifdef MEMSHR
+	memshr_daemon_initialize();
+#endif
 
  retry:
 	/* Set up store connection and watch. */
diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap2/drivers/Makefile
--- a/tools/blktap2/drivers/Makefile	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap2/drivers/Makefile	Mon Jan 11 15:53:25 2010 +0100
@@ -55,7 +55,15 @@
 
 LIBAIO_DIR = $(XEN_ROOT)/tools/libaio/src
 MEMSHR_DIR = $(XEN_ROOT)/tools/memshr
+
+ifeq ($(CONFIG_Linux), y)
+CFLAGS += -DMEMSHR
 MEMSHRLIBS := $(MEMSHR_DIR)/libmemshr.a
+endif
+ifeq ($(CONFIG_NetBSD), y)
+MEMSHRLIBS :=
+endif
+
 tapdisk2 tapdisk-stream tapdisk-diff $(QCOW_UTIL): AIOLIBS := $(LIBAIO_DIR)/libaio.a 
 tapdisk-client tapdisk-stream tapdisk-diff $(QCOW_UTIL): CFLAGS  += -I$(LIBAIO_DIR) -I$(XEN_LIBXC)
 
diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap2/drivers/tapdisk-image.c
--- a/tools/blktap2/drivers/tapdisk-image.c	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap2/drivers/tapdisk-image.c	Mon Jan 11 15:53:25 2010 +0100
@@ -28,7 +28,9 @@
 #include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
+#ifdef MEMSHR
 #include <memshr.h>
+#endif
 
 #include "tapdisk-image.h"
 #include "tapdisk-driver.h"
@@ -57,7 +59,9 @@
 	image->flags     = flags;
 	image->storage   = storage;
 	image->private   = private;
-    image->memshr_id = memshr_vbd_image_get(file);
+#ifdef MEMSHR
+	image->memshr_id = memshr_vbd_image_get(file);
+#endif
 	INIT_LIST_HEAD(&image->next);
 
 	return image;
@@ -71,7 +75,9 @@
 
 	list_del(&image->next);
 
-    memshr_vbd_image_put(image->memshr_id);
+#ifdef MEMSHR
+	memshr_vbd_image_put(image->memshr_id);
+#endif
 	free(image->name);
 	tapdisk_driver_free(image->driver);
 	free(image);
diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap2/drivers/tapdisk-vbd.c
--- a/tools/blktap2/drivers/tapdisk-vbd.c	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap2/drivers/tapdisk-vbd.c	Mon Jan 11 15:53:25 2010 +0100
@@ -34,7 +34,9 @@
 #include <libgen.h>
 #include <sys/mman.h>
 #include <sys/ioctl.h>
+#ifdef MEMSHR
 #include <memshr.h>
+#endif
 
 #include "libvhd.h"
 #include "tapdisk-image.h"
@@ -107,7 +109,9 @@
 	vbd->callback = tapdisk_vbd_callback;
 	vbd->argument = vbd;
     
-    memshr_vbd_initialize();
+#ifdef MEMSHR
+	memshr_vbd_initialize();
+#endif
 
 	INIT_LIST_HEAD(&vbd->driver_stack);
 	INIT_LIST_HEAD(&vbd->images);
@@ -1455,18 +1459,23 @@
 			    (treq.op == TD_OP_WRITE ? "write" : "read"),
 			    treq.secs, treq.sec);
 		}
-	} else 
-    if(treq.op == TD_OP_READ && td_flag_test(image->flags, TD_OPEN_RDONLY)) {
-        uint64_t         hnd  = treq.memshr_hnd;
-        uint16_t         uid  = image->memshr_id;
-        blkif_request_t *breq = &vreq->req;
-        uint64_t         sec  = tapdisk_vbd_breq_get_sector(breq, treq);
-        int              secs = breq->seg[treq.sidx].last_sect -
-                                breq->seg[treq.sidx].first_sect + 1;
+	} else {
+#ifdef MEMSHR
+		if (treq.op == TD_OP_READ
+		   && td_flag_test(image->flags, TD_OPEN_RDONLY)) {
+			uint64_t hnd  = treq.memshr_hnd;
+			uint16_t uid  = image->memshr_id;
+			blkif_request_t *breq = &vreq->req;
+			uint64_t sec  = tapdisk_vbd_breq_get_sector(breq, treq);
+			int secs = breq->seg[treq.sidx].last_sect -
+			    breq->seg[treq.sidx].first_sect + 1;
 
-        if(hnd != 0)
-            memshr_vbd_complete_ro_request(hnd, uid, sec, secs);
-    }
+			if (hnd != 0)
+				memshr_vbd_complete_ro_request(hnd, uid,
+								sec, secs);
+		}
+#endif
+	}
 
 	tapdisk_vbd_complete_vbd_request(vbd, vreq);
 }
@@ -1518,29 +1527,28 @@
 		break;
 
 	case TD_OP_READ:
-        if(td_flag_test(parent->flags, TD_OPEN_RDONLY))
-        {
-            int ret, seg = treq.sidx;
-            blkif_request_t *breq = &vreq->req;
+#ifdef MEMSHR
+		if(td_flag_test(parent->flags, TD_OPEN_RDONLY)) {
+			int ret, seg = treq.sidx;
+			blkif_request_t *breq = &vreq->req;
         
-            ret = memshr_vbd_issue_ro_request(treq.buf,
-                                              breq->seg[seg].gref,
-                                              parent->memshr_id,
-                                              treq.sec,
-                                              treq.secs,
-                                              &treq.memshr_hnd);
-            if(ret == 0)
-            {
-                /* Reset memshr handle. This'll prevent
-                 * memshr_vbd_complete_ro_request being called */
-                treq.memshr_hnd = 0;
-                td_complete_request(treq, 0);
-            }
-            else
-		        td_queue_read(parent, treq);
-        }
-        else
-		    td_queue_read(parent, treq);
+			ret = memshr_vbd_issue_ro_request(treq.buf,
+			      breq->seg[seg].gref,
+			      parent->memshr_id,
+			      treq.sec,
+			      treq.secs,
+			      &treq.memshr_hnd);
+			if(ret == 0) {
+				/* Reset memshr handle. This'll prevent
+				 * memshr_vbd_complete_ro_request being called
+				 */
+				treq.memshr_hnd = 0;
+				td_complete_request(treq, 0);
+			} else
+				td_queue_read(parent, treq);
+		} else
+#endif
+			td_queue_read(parent, treq);
 		break;
 	}
 
diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap2/drivers/tapdisk.h
--- a/tools/blktap2/drivers/tapdisk.h	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap2/drivers/tapdisk.h	Mon Jan 11 15:53:25 2010 +0100
@@ -132,7 +132,9 @@
 	int                          sidx;
 	void                        *private;
     
-    uint64_t                     memshr_hnd;
+#ifdef MEMSHR
+	uint64_t                     memshr_hnd;
+#endif
 };
 
 /* 
diff -r 3e97e3386dff -r 0f4594929dfa tools/blktap2/drivers/tapdisk2.c
--- a/tools/blktap2/drivers/tapdisk2.c	Mon Jan 11 15:52:13 2010 +0100
+++ b/tools/blktap2/drivers/tapdisk2.c	Mon Jan 11 15:53:25 2010 +0100
@@ -34,7 +34,9 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/ioctl.h>
+#ifdef MEMSHR
 #include <memshr.h>
+#endif
 
 #include "tapdisk.h"
 #include "blktap2.h"
@@ -419,10 +421,15 @@
 			break;
 		case 'h':
 			usage(argv[0], 0);
-            break;
-        case 's':
-            memshr_set_domid(atoi(optarg));
-            break;
+			break;
+		case 's':
+#ifdef MEMSHR
+			memshr_set_domid(atoi(optarg));
+#else
+			fprintf(stderr, "MEMSHR support not compiled in.\n");
+			exit(EXIT_FAILURE);
+#endif
+			break;
 		default:
 			usage(argv[0], EINVAL);
 		}