diff --git a/scripts/build-common b/scripts/build-common
index d2a85731..9dd3aa73 100644
--- a/scripts/build-common
+++ b/scripts/build-common
@@ -4,6 +4,15 @@
 : ${BUILD:=$(pwd)/build}
 : ${DIST:=$(pwd)/dist}
 
+# PREREQ: brew install coreutils
+path()
+{
+    local UNAME=$(uname)
+    if [ "$UNAME" == "Darwin" ]; then greadlink -f "$1"
+    elif [ "$UNAME" == "Linux" ]; then readlink -f "$1";
+    fi
+}
+
 write_base()
 {
     DOCKER_BASE=${DOCKER_BASE:?"DOCKER_BASE not defined"}
diff --git a/scripts/run b/scripts/run
index d3172745..65ffce08 100755
--- a/scripts/run
+++ b/scripts/run
@@ -26,7 +26,7 @@ while [ "$#" -gt 0 ]; do
             ;;
         --cloud-config)
             shift 1
-            CLOUD_CONFIG=$(readlink -f "$1") || :
+            CLOUD_CONFIG=$(path "$1") || :
             if [ ! -f ${CLOUD_CONFIG} ]; then
                 echo No such file: "'"${CLOUD_CONFIG}"'" 1>&2
                 exit 1