From 4fe688dae02de29efeec0875457249a4a03dbb16 Mon Sep 17 00:00:00 2001
From: Joschka Lingemann <joschka.lingemann@cern.ch>
Date: Mon, 20 Mar 2017 18:24:04 +0100
Subject: [PATCH 1/2] Add checks for DAG, show errors also on Mac

---
 init.sh | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/init.sh b/init.sh
index ceff5e00..59b6bba2 100644
--- a/init.sh
+++ b/init.sh
@@ -10,18 +10,27 @@ fi
 if [[ "$unamestr" == 'Linux' ]]; then
     platform='Linux'
     if [[ -d /cvmfs/fcc.cern.ch/sw ]] ; then
-    #should check domain to make sure we're at CERN
-    #or is this software available somewhere in Lyon?
-    source /cvmfs/fcc.cern.ch/sw/0.8/init_fcc_stack.sh
+        #should check domain to make sure we're at CERN
+        #or is this software available somewhere in Lyon?
+        source /cvmfs/fcc.cern.ch/sw/0.8/init_fcc_stack.sh
     else
-        if [ -z "$PODIO" ]; then
-            echo "[ERROR] no podio setup detected, make sure it is setup"
-            exit 1
+        if [ ! -z "$PODIO" ]; then
+            export LD_LIBRARY_PATH=$FCCEDM/lib:$PODIO/lib:$LD_LIBRARY_PATH
         fi
-        export LD_LIBRARY_PATH=$FCCEDM/lib:$PODIO/lib:$LD_LIBRARY_PATH
     fi
 elif [[ "$unamestr" == 'Darwin' ]]; then
     platform='Darwin'
-    export DYLD_LIBRARY_PATH=$FCCEDM/lib:$DYLD_LIBRARY_PATH:$PODIO/lib
+    if [ ! -z "$PODIO" ]; then
+        export DYLD_LIBRARY_PATH=$FCCEDM/lib:$DYLD_LIBRARY_PATH:$PODIO/lib
+    fi
+fi
+if [ -z "$PODIO" ]; then
+    echo "[ERROR] no podio setup detected, make sure it is setup"
+    exit 1
 fi
+if [ -z "$FCCDAG" ]; then
+    echo "[ERROR] no dag setup detected, make sure it is setup by setting the FCCDAG environment variable or adding it to your cmake prefix path"
+    exit 1
+fi
+
 echo platform detected: $platform

From 0765dbe39110c2e94948c4e9be4615d0ae6a2c6c Mon Sep 17 00:00:00 2001
From: Joschka Lingemann <joschka.lingemann@cern.ch>
Date: Mon, 20 Mar 2017 18:24:45 +0100
Subject: [PATCH 2/2] Add dag dependency to README.

---
 README.md | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 18e822c7..394f3e02 100644
--- a/README.md
+++ b/README.md
@@ -31,13 +31,19 @@ On Mac OS or Ubuntu, you need to install the following software.
 
 https://github.com/HEP-FCC/podio
 
+### Directed Acyclic Graph
+
+https://github.com/HEP-FCC/dag
+
 
 Setting up
 --
 
 Before compiling or using:
 
-1. If on Mac OS, Ubuntu or using a custom PODIO installation, set up the PODIO environment.
+1. If on Mac OS, Ubuntu or using a custom installations:
+   -  set up the PODIO environment (sourcing the PODIO `init.sh`)
+   - set up the dag environment (set the FCCDAG environment variable to the install directory)
 
 2. Set up the FCC-EDM environment:
 ```