I see three references to systemRequirements in Writing R Extensions.
The one you list in your last email, this one:
"If your package requires one of these interpreters or an extension
then this should be declared in the ‘SystemRequirements’ field of its
DESCRIPTION file." [for listing interpreters to run scripts]
and
"If you really must assume GNU make, declare it in the DESCRIPTON file by
SystemRequirements: GNU make"
A grep of a complete R 2.15-2 source tree doesn't show it being used
either. It's mentioned in the OONEWS file for R 1.7.0
"It is now recommended to use the 'SystemRequirements:' field in the
DESCRIPTION file for specifying dependencies external to the R
system."
Grepping all the DESCRIPTION files on my work box shows such values
for that field as:
"GRASS (>=6.3)"
"An ODBC3 driver manager and drivers"
"libxml2 (>=2.6.3)"
"OpenGL, GLU Library, zlib (optional), libpng)
"for building from source: GDAL >= 1.6.0 library"
some of which look pretty free-form descriptive to me.
Hope that's a bit more useful than 'No'.
On Wed, Dec 12, 2012 at 7:55 PM, Paul Gilbert <pgilbert...@gmail.com> wrote:
>
>
> On 12-12-12 02:19 PM, Prof Brian Ripley wrote:
>> On 12/12/2012 18:33, Paul Gilbert wrote:
>>> Am I correct in thinking that the ‘SystemRequirements’ field in a
>>> package DESCRIPTION file is purely descriptive, there are no standard
>>> elements that can be extracted by parsing it and used automatically?
>>
>> No.
>>
>
> Where can I find more details? The section "The DESCRIPTION file" in
> "Writing R Extensions" says only:
>
> Other dependencies (external to the R system) should be listed in
> the ‘SystemRequirements’ field, possibly amplified in a separate
> README file.
>
> Thanks,
> Paul
>
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