diff --git a/build.sh b/build.sh
old mode 100644
new mode 100755
index 8f26542..44b9c76
--- a/build.sh
+++ b/build.sh
@@ -146,11 +146,8 @@ done
 export PI_GEN=${PI_GEN:-pi-gen}
 export PI_GEN_REPO=${PI_GEN_REPO:-https://github.com/RPi-Distro/pi-gen}
 
-if [ -z "${IMG_NAME}" ]; then
-	echo "IMG_NAME not set" 1>&2
-	exit 1
-fi
-
+export IMG_NAME="${IMG_NAME:-RasbianBurrow}"
+export RUDEFOX_BURROW_VERSION=${RUDEFOX_BURROW_VERSION:-"0.0.2"}
 export USE_QEMU="${USE_QEMU:-0}"
 export IMG_DATE="${IMG_DATE:-"$(date +%Y-%m-%d)"}"
 export IMG_FILENAME="${IMG_FILENAME:-"${IMG_DATE}-${IMG_NAME}"}"