It is very easy to make the library. Just create a new library and add symbol and package and make a device. Then open ic package library and copy 40 pin DIP package and then come back to your new library's package and paste it. Then make symbol and then map the pins and finally add symbol and package to device. Then create a new project and add sch and brd files and then choose Use library menu item and add your new library. Now you can use your new device in schematic and board.