diff --git a/ndiswrapper/driver/Makefile b/ndiswrapper/driver/Makefile
index b0c2a9d..8907a05 100644
--- a/ndiswrapper/driver/Makefile
+++ b/ndiswrapper/driver/Makefile
@@ -119,6 +119,10 @@ ifdef WRAP_PREEMPT
 MOD_CFLAGS += -DWRAP_PREEMPT
 endif
 
+ifdef DIST_DESTDIR
+MOD_CFLAGS += -DPREFIX=\"$(DIST_DESTDIR)\"
+endif
+
 .PHONY: prereq_check gen_exports clean dist_clean install stack_check
 
 all : prereq_check win2lin_stubs.h gen_exports compat.h default stack_check
@@ -355,7 +359,7 @@ install: prereq_check win2lin_stubs.h gen_exports compat.h default stack_check
 	echo $(INST_DIR)
 	mkdir -p $(INST_DIR)
 	install -m 0644 $(MODULE) $(INST_DIR)
-	-@/bin/rm -rf $(SRC_DIR)/.tmp_versions
+	-@rm -rf $(SRC_DIR)/.tmp_versions
 ifndef DIST_DESTDIR
 	-/sbin/depmod -a $(KVERS) -b $(DESTDIR)
 endif
diff --git a/ndiswrapper/driver/loader.c b/ndiswrapper/driver/loader.c
index 930606f..9a8e9f0 100644
--- a/ndiswrapper/driver/loader.c
+++ b/ndiswrapper/driver/loader.c
@@ -106,7 +106,7 @@ struct wrap_driver *load_wrap_driver(struct wrap_device *wd)
 			EXIT1(return NULL);
 		}
 		INIT_COMPLETION(loader_complete);
-		ret = call_usermodehelper("/sbin/loadndisdriver", argv, env
+		ret = call_usermodehelper(USERMOD_HELPER, argv, env
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
 					  , 1
 #endif
@@ -272,7 +272,7 @@ struct wrap_bin_file *get_bin_file(char *bin_file_name)
 			EXIT1(return NULL);
 		}
 		INIT_COMPLETION(loader_complete);
-		ret = call_usermodehelper("/sbin/loadndisdriver", argv, env
+		ret = call_usermodehelper(USERMOD_HELPER, argv, env
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
 					  , 1
 #endif
@@ -711,7 +711,7 @@ struct wrap_device *load_wrap_device(struct load_device *load_device)
 			EXIT1(return NULL);
 		}
 		INIT_COMPLETION(loader_complete);
-		ret = call_usermodehelper("/sbin/loadndisdriver", argv, env
+		ret = call_usermodehelper(USERMOD_HELPER, argv, env
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
 					  , 1
 #endif
diff --git a/ndiswrapper/driver/ndiswrapper.h b/ndiswrapper/driver/ndiswrapper.h
index 4a78dc6..c11a074 100644
--- a/ndiswrapper/driver/ndiswrapper.h
+++ b/ndiswrapper/driver/ndiswrapper.h
@@ -19,8 +19,17 @@
 #define DRIVER_VERSION "1.50"
 #define UTILS_VERSION "1.9"
 
+#ifndef PREFIX
+#define PREFIX
+#endif
+
 #define DRIVER_NAME "ndiswrapper"
-#define DRIVER_CONFIG_DIR "/etc/ndiswrapper"
+
+#ifndef DRIVER_CONFIG_DIR
+#  define DRIVER_CONFIG_DIR PREFIX "/etc/ndiswrapper"
+#endif
+
+#define USERMOD_HELPER PREFIX "/sbin/loadndisdriver"
 
 #define SSID_MAX_WPA_IE_LEN 40
 #define NDIS_ESSID_MAX_SIZE 32