Sketch, export binary does not work on Linux Mint 17.2

Good day.

I want to export and archive binaries of completed projects for my Due using Arduino 1.6.5 on Linux Mint 17.2. But when using the menu item to export the sketch I keep getting: Warning: This core does not support exporting sketches. Please consider upgrading it or contacting its author.

This happens with example sketches and my own project which compile, upload and work perfectly with the Dues I am using.

Thoughts on how I might correct this?

Thank you

Mark MacKenzie, aka Matadormac