title: Emacs restore desktop interrupts with message "apply: Searching for program: No such file or directory, rcsdiff"
body: <p>When I restart emacs, desktopaid's dta-load-session tries to restore my session (all files and windows), but breaks with the error message</p>
  
  <pre><code>apply: Searching for program: No such file or directory, rcsdiff
  </code></pre>
  
  <p>How can I find out which file makes emacs search for rcsdiff so that I can kill that buffer for the next time?</p>
  
  <p>(Emacs 25.1.1 on MacOS)</p>