[R-pkg-devel] Issue: Function found when exporting methods from the namespace ‘raster’ which is not S4 generic: ‘all.equal’

[Patrick Giraudoux]

Dear listers,

One user (in cc) has signaled a problem installing the package pgirmess 
(versin 1.7.1 on CRAN), with this message on loading:

> library(pgirmess)

Error: package or namespace load failed for ‘pgirmess’:

Function found when exporting methods from the namespace ‘raster’ which 
is not S4 generic: ‘all.equal’

In addition: Warning message:

no function found corresponding to methods exports from ‘raster’ for: 
‘direction’, ‘gridDistance’

I cannot identify where the trouble comes from since:

- pgirmess goes through OK in all the checks on CRAN

- I can install/remove it with correct loading on my own platform

- pgirmess 1.7.1 does not import 'raster' and the functions mentioned above

The user has installed the last R version on Windows.  However, she gets 
a correct loading only if she loads 'Matrix' before (or 'lme4' - but to 
my knowlege, lme4 actually loads Matrix).

She meets also the same issuer with pgirmess 2.0 (not on CRAN yet, see 
https://github.com/pgiraudoux/pgirmess however this version (still on 
test) has deprecated/dropped all functions related to dealing with rasters.

This occurs in R directly (not necessarily within RStudio).

On the web, Iook likes this issue has is already been spotted for some 
other packages (e.g. mapview, tmap, etc.). Checking help-lists I saw 
that installing rtools might solve the problem (e.g. 
https://community.rstudio.com/t/error-package-or-namespace-load-failed-for-mapview/126914) 
however, it seems to me a strange workaround since rtools should not be 
made necessary for lay R user (not developers).

Best,





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