Patch up OPEN command in git scripts

buildroot/share/git/firstpush

@@ -16,13 +16,15 @@ BRANCH=${INFO[5]}
 
 git push --set-upstream origin $BRANCH
 
-TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+which xdg-open >/dev/null && TOOL=xdg-open
+which gnome-open >/dev/null && TOOL=gnome-open
+which open >/dev/null && TOOL=open
 URL="https://github.com/$FORK/$REPO/commits/$BRANCH"
 
-if [ -z "$TOOL" ]; then
+if [ -z "$OPEN" ]; then
   echo "Can't find a tool to open the URL:"
   echo $URL
 else
   echo "Viewing commits on $BRANCH..."
-  "$TOOL" "$URL"
+  "$OPEN" "$URL"
 fi