Setting different R_HOME for the callr subprocess

[maksymiuks]

Hi

I'm trying to spin a new callr process that is different from the default R_HOME value. In general, I want my subprocess to operate on the different base library (alternative location for .Library), and for that, it has to start with a different R_HOME value. Unfortunately, whenever I try to set R_HOME for the caller subprocess, it does not work. It does not matter for my use case whether I use default or alternative R executable, so I tried using the arch parameter, but seemingly still the default R_HOME was used. Is there a way to achieve such replacement in the callr?

[gaborcsardi]

Can you try to show an example?