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

[Patrick Giraudoux]

A Master student of  us has just send us the way he has found to get out 
of the problem met. Here is the translation of his mail:

I have updated R to 4.1.2 using updateR() of the package installr from 
the R consol, specifying I want to keep the packages.

I have installed Rtools from there: 
https://cran.rstudio.com/bin/windows/Rtools/rtools40.html

Then I have opened the consol and applied:

write('PATH="${RTOOLS40_HOME}\\usr\\bin;${PATH}"', file = "~/.Renviron", 
append = TRUE)

then restarted R, and checked the RTools path applying:

Restart R, and verify that make can be found, which should show the path 
to your Rtools installation.

Sys.which("make")
## "C:\\rtools40\\usr\\bin\\make.exe"

then install.packages("terra", type = "source")

It has solved the problem, pgirmess work without trouble now.

This fit with Roger's info about late updates from *.tar.gz and *.zip  
on CRAN messing a standard installation.

Best,

Patrick

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