makesdk now checks if unzip is installed

src/makesdk.sh

@@ -23,6 +23,12 @@ if [ -d "$XSDKSDKDIR" ] ; then
     exit 1
 fi
 
+if ! type "unzip" 2> /dev/null > /dev/null ; then
+    echo -e "\e[1;31mThe tool unzip is missing."
+    echo -e "\e[1;30mTo run this script, you need to install unzip."
+    exit 1
+fi
+
 # Prepare environment
 echo -e -n "\e[1;34mCreating SDK tree in \e[0;36m$SDKDIR\e[1;34m: "
 mkdir -p $SDKDIR/lib