When install org, compilation fails with | org-clock.el:1958:1:Error: Invalid read syntax: "?"
This seems to happen due to the non-ascii charecter in line 1974. Adding a ;; coding: utf-8 local variable fixes it. Enrico Emacs : GNU Emacs 25.3.1 (x86_64-redhat-linux-gnu, GTK+ Version 2.24.31) of 2017-09-22 Package: Org mode version 9.1.1 (9.1.1-6-gd40deb-elpa @ /home/ensc/.emacs.d/elpa/org-20170925/)