--- a/trunk/wharfie/wharfie.mk
+++ b/trunk/wharfie/wharfie.mk
@@ -28,6 +28,7 @@
 FAKECHROOT=$(shell PATH=${PATH}:/sbin:/usr/sbin which fakechroot)
 DBOOTSTRAP=$(shell PATH=${PATH}:/sbin:/usr/sbin which qemu-debootstrap)
 DBOOTSTRAP2=$(shell PATH=${PATH}:/sbin:/usr/sbin which debootstrap)
+KPARTX=$(shell PATH=${PATH}:/sbin:/usr/sbin which kpartx)
 PACKAGES=locales systemd
 
 MAKEFILE_PATH := $(abspath $(lastword $(MAKEFILE_LIST)))
@@ -54,6 +55,10 @@
 
 ifeq (${DBOOTSTRAP2},)
 $(error debootstrap not found. On debian, you may install the package debootstrap first)
+endif
+
+ifeq (${KPARTX},)
+$(error kpartx not found. On debian, you may install the package kpartx first)
 endif
 
 .PHONY: test