Hi Gustavo,
Thanks for getting back to me.  It is definitely a GhostBSD / TrueOS 
thing.  My masochistic tendencies persuaded me to reinstall a FreeBSD 
desktop and lo and behold everything is OK.  I was running it in DrRacket.
cheers,
greadey

On Saturday, 25 January 2020 18:30:31 UTC, gustavo wrote:
>
> It is an internal function of the math package 
> https://github.com/racket/math/blob/cdc64390f1e7b75de9575a91f0ec3a31f7878530/math-lib/math/private/bigfloat/mpfr.rkt#L587that
>  
> is used to show bigfloats. 
>
> I can't reproduce the error in Windows, but it doesn't look like an error 
> that is platform dependent. Are you running this in DrRacket or in the 
> command line? Any unusual configuration?
>
> Is the code available? Can you send a minimized example? Try to remove as 
> much as you can (including all the secret sauce if it is an internal 
> project). Any example that shows the error would be very helpful, but if 
> you can reduce the example to a hundred of lines it would be nice. And 
> shorter examples are better, even if the code makes no sense.
>
> Gustavo
>
>
> On Sat, Jan 25, 2020 at 9:34 AM greadey <gre...@gmail.com <javascript:>> 
> wrote:
>
>> Hi there,
>>
>> I am running racket 7.5 on GhostBSD 20.01, I am getting a strange error 
>> running a file which previously ran OK on FreeBSD 12.
>>
>> ../../../../local/share/racket/collects/racket/pretty.rkt:478:8: 
>> bigfloat-custom-write: undefined;
>>  cannot reference an identifier before its definition.
>>
>> What I cannot understand is that big-float-custom-write is not listed in 
>> the documentation.  Does anyone have any ideas what might be causing this?
>>
>> Cheers,
>>
>> greadey
>>
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