[racket-dev] installing XREPL

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Hi,

XREPL is said to be able to edit your .racketrc in the docs, but
apparently doesn't cope well with that file not existing yet:

$ racket
Welcome to Racket v5.2.0.7.
> (require xrepl)
; Warning: no readline support (ffi-lib: couldn't open
"libreadline.so.5" (libreadline.so.5: cannot open shared object file:
No such file or directory))
- -> ,install!
file-size: file not found: "/home/marijn/.racketrc"
- ->

and indeed it doesn't get created:

$ cat ~/.racketrc
cat: /home/marijn/.racketrc: No such file or directory

Marijn
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