Deleting config only if it exist
diff --git a/xos/configurations/cord/Makefile b/xos/configurations/cord/Makefile
index ef823cd..0814302 100644
--- a/xos/configurations/cord/Makefile
+++ b/xos/configurations/cord/Makefile
@@ -3,7 +3,7 @@
 LAST_CONTAINER=$(shell sudo docker ps -l -q)
 
 cord: common_cloudlab ceilometer_dashboard virtualbng_json
-	rm ../../xos_configuration/*
+	if [ -a ../../xos_configuration/* ]; then rm ../../xos_configuration/*; fi
 	echo "# Autogenerated -- do not edit" > Dockerfile
 	cat ../common/Dockerfile.common Dockerfile.cord >> Dockerfile
 	cp ../common/xos_common_config ../../xos_configuration/
diff --git a/xos/configurations/devel/Makefile b/xos/configurations/devel/Makefile
index 216673d..accb221 100644
--- a/xos/configurations/devel/Makefile
+++ b/xos/configurations/devel/Makefile
@@ -7,7 +7,7 @@
 devstack: common_devstack xos
 
 xos:
-	rm ../../xos_configuration/*
+	if [ -a ../../xos_configuration/* ]; then rm ../../xos_configuration/*; fi
 	cp ../common/xos_common_config ../../xos_configuration/
 	echo "# Autogenerated -- do not edit" > Dockerfile
 	cat ../common/Dockerfile.common Dockerfile.devel >> Dockerfile
diff --git a/xos/configurations/frontend/Makefile b/xos/configurations/frontend/Makefile
index e30877a..96b0779 100644
--- a/xos/configurations/frontend/Makefile
+++ b/xos/configurations/frontend/Makefile
@@ -6,7 +6,7 @@
 all: frontend
 
 frontend:
-	rm ../../xos_configuration/*
+	if [ -a ../../xos_configuration/* ]; then rm ../../xos_configuration/*; fi
 	sudo apt-get -y install httpie
 	cat ../common/Dockerfile.common Dockerfile.frontend > Dockerfile
 	cp ../common/xos_common_config ../../xos_configuration/
@@ -16,7 +16,7 @@
 	echo $(RUNNING_CONTAINER)
 
 interactive:
-	rm ../../xos_configuration/*
+	if [ -a ../../xos_configuration/* ]; then rm ../../xos_configuration/*; fi
 	cat ../common/Dockerfile.common Dockerfile.frontend > Dockerfile
 	cp ../common/xos_common_config ../../xos_configuration/
 	#cp ../cord/xos_cord_config ../../xos_configuration/
diff --git a/xos/configurations/test/Makefile b/xos/configurations/test/Makefile
index b1cca93..75143fa 100644
--- a/xos/configurations/test/Makefile
+++ b/xos/configurations/test/Makefile
@@ -1,6 +1,7 @@
 MYIP:=$(shell hostname -i)
 
 test: common_cloudlab
+	if [ -a ../../xos_configuration/* ]; then rm ../../xos_configuration/*; fi
 	cat ../common/Dockerfile.common Dockerfile.test > Dockerfile
 	cd ../../..; sudo docker build -t xos -f xos/configurations/test/Dockerfile .
 	# sudo docker run -d --add-host="ctl:$(MYIP)" -p 9999:8000 xos