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I'm using GNU Emacs 26.0.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.5) of 2016-12-20, with arch linux (antergos), I want to start with the option tcp server, so I added and assigment to the variable server-use-tcp,

(setq server-use-tcp t)

and I get this warning: 

In toplevel form:
init.el:15:7:Warning: assignment to free variable ‘server-use-tcp’

Is this variable deleted?, or is the wrong way to this? or what library I need to require before setting that variable?

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    This variable is defined in server.el. Could you try to (require 'server) before you set this variable?
    – wvxvw
    Dec 24, 2016 at 8:51
  • Indeed. Running server-start also makes it available (through autoloading). Note this is not new to emacs 26.
    – JeanPierre
    Dec 24, 2016 at 9:19

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