Hello I just try out ahg.el a package for mercurial found in ELPA. Now it seems not to work in GNU emacs 25, I wrote the author and the problem seems to be this setting: (defcustom ahg-global-key-prefix "^Chg" "Prefix of globally-available aHg commands." :group 'ahg :type 'string :set (function (lambda (symbol value) (when (boundp symbol) (global-unset-key (eval symbol))) (global-set-key (set symbol value) ahg-global-map)))) This gives an error, I attach it just in case. So how should a global-key-prefix be set in Emacs 25? Thanks Uwe Brauer