Patch up OPEN command in git scripts

buildroot/share/git/mfpr

@@ -23,15 +23,17 @@ OLDBRANCH=${INFO[5]}
 # See if it's been pushed yet
 if [ -z "$(git branch -vv | grep ^\* | grep \\[origin)" ]; then firstpush; fi
 
-TOOL=$(which gnome-open xdg-open open | awk '{ print $1 }')
+which xdg-open >/dev/null && TOOL=xdg-open
+which gnome-open >/dev/null && TOOL=gnome-open
+which open >/dev/null && TOOL=open
 URL="https://github.com/$ORG/$REPO/compare/$TARG...$FORK:$BRANCH?expand=1"
 
-if [ -z "$TOOL" ]; then
+if [ -z "$OPEN" ]; then
   echo "Can't find a tool to open the URL:"
   echo $URL
 else
   echo "Opening a New PR Form..."
-  "$TOOL" "$URL"
+  "$OPEN" "$URL"
 fi
 
 [[ $BRANCH != $OLDBRANCH ]] && git checkout $OLDBRANCH