[Rd] R package compilation: files in src directory should be ignored if C library is not available

Cule, Erika erika.cule05 at imperial.ac.uk
Fri Aug 17 14:07:22 CEST 2012

Ah I see! Had not thought of that solution.

(This is the first time I have tried to use autoconf and configure)

Many thanks.


On 17 Aug 2012, at 13:04, Dirk Eddelbuettel wrote:

> On 17 August 2012 at 11:44, Cule, Erika wrote:
> | If so, I still don't understand what happens when I compile the package if GSL is not installed on the computer, as there will still be C code in the src directory.
> That is precisely the use case for autoconf et al.
> You test if something (here GSL) is available (and there are macros and
> examples for in many places) and then define a header file variable such as
> I_HAVE_FOUND_GSL as 1 or 0, say.  In your C code, you then use something like
>   #if I_HAVE_FOUND_GSL == 1
>       some code
>   #endif 
> Now your code compiles in both cases.
> Alternatively, you just depend on the GSL. Many packages on CRAN do, and the
> Windows build infrastructure provides it.
> Dirk
> -- 
> Dirk Eddelbuettel | edd at debian.org | http://dirk.eddelbuettel.com  

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