There are specific targets to uninstall info and PDF manuals in file doc/manual/Makefile. Note that you may need to specify implicitly or explicitly the library to which the package is to be installed. Most OSes running on such CPUs offer the choice of building a 32-bit or a 64-bit version of R (and details are given below under specific OSes). For most a 32-bit version is the default, but for some (e.g., ‘x86_64’ Linux and macOS >= 10.6) 64-bit is.
Regarding Jeffrey Evans’ speculation that MGET does not utilize the R raster package. See for how users can set their locales. As with Windows, end users will generally only see lists of languages/territories. The error rates are calculated from the mean of squared errors (MSE) for all trees for regression, or misclassification rates for classification. Note that you will be asked to choose a language for installation, and that choice applies to both installation and un-installation but not to running R itself.
This affects both checking the package examples (part of make check) and package sources (part of make check-devel and make check-recommended). It does require a make command which supports the make -j n option: most do but on Solaris you need to select GNU make or dmake. Thirdly, annual ISA maps of finer spatial resolution by a spatio-temporal sub-pixel classification model using such as multi-temporal Landsat images are expected. Where parallel checking of package sources is done, a log file pngname.log is left in the tests directory for inspection.