Re: [Chicken-users] How to use prelude?

[Kon Lovett]

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On May 27, 2006, at 4:08 AM, Peter Bex wrote:

> Hey all,
>
> I'm trying to conditionally add a prelude to an egg.  It checks if  
> X is
> available by trying to link against it, and then it does the  
> following:
>
> (if with-x?
>     (compile -prelude (define with-x #t) -s -O2 -d0 imlib2.scm -C - 
> I/usr/X11R6/include -L/usr/X11R6/lib -lImlib2 -lX11 -lfreetype)
>     (compile -prelude (define with-x #t) -s -O2 -d0 imlib2.scm -ffi- 
> define X_DISPLAY_MISSING))
>
> But this fails on the prelude with:
> Syntax error: "(" unexpected
>
> Adding a quote in front of the define doesn't work either as that  
> expands
> to (quote (define with-x #t))

Put quotes around it? "(define with-x #t)" Ultimately this turns into  
(system* "...") so the parens will be seen by the shell parser.

> How does this work, then?  (also, can I use cond-expand with this?   
> I'm not
> sure how to add features cond-expand can check against)

I think 'register-feature!'

> Peter
> --
> http://sjamaan.ath.cx
> --
> "The process of preparing programs for a digital computer
>  is especially attractive, not only because it can be economically
>  and scientifically rewarding, but also because it can be an aesthetic
>  experience much like composing poetry or music."
>                                                         -- Donald Knuth
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