From 92ce9fa333591fb06fb5c550dce4510f58874797 Mon Sep 17 00:00:00 2001
From: Takahiro Ueda <t.ueda.od@juntendo.ac.jp>
Date: Sat, 24 Aug 2024 22:36:52 +0900
Subject: [PATCH] Fix UndefinedVar warnings during Docker build

https://docs.docker.com/go/dockerfile/rule/undefined-var
---
 Dockerfile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Dockerfile b/Dockerfile
index ffadcb4..46c064f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -45,8 +45,8 @@ ENV MG_FOLDER_PATH="${SOFTWARE_FOLDER}/${MG_FOLDER}"
 ENV MG_BINARY_PATH="${SOFTWARE_FOLDER}/${MG_FOLDER}/bin/mg5_aMC"
 
 #### CERN ROOT environment variables
-ENV PATH=$PATH:$ROOTSYS/bin
-ENV LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$ROOTSYS/lib
+ENV PATH=${PATH-}:$ROOTSYS/bin
+ENV LD_LIBRARY_PATH=${LD_LIBRARY_PATH-}:$ROOTSYS/lib
 
 
 ### Install MadGraph 5 Python dependencies
@@ -69,7 +69,7 @@ RUN echo "set auto_convert_model T" | python3 ${MG_BINARY_PATH}
 RUN echo "import model EWdim6-full" | python3 ${MG_BINARY_PATH}
 
 # Delphes environment variables
-ENV ROOT_INCLUDE_PATH="${ROOT_INCLUDE_PATH}:${MG_FOLDER_PATH}/Delphes/external"
+ENV ROOT_INCLUDE_PATH="${ROOT_INCLUDE_PATH-}:${MG_FOLDER_PATH}/Delphes/external"
 
 
 #### Copy files