[R] rstan error: C:/Rtools/mingw_64/bin/g++: not found

[S Ellison]

Apologies for posting a possibly package-specific question, but I'm not sure whether this is an R or rstan ussue.

Running rstan under R 3.1.1 in windows 10 I get the well-known error
"Compilation ERROR, function(s)/method(s) not created! C:/Rtools/mingw_64/bin/g++: not found"

The cause on my system is simple; g++ is not on my C:\ drive; it's on D: 
My system path correctly points to D:, running 

> system('g++ -v') 

works fine. But the error message shows that either rstan or R is insisting on a specific call on C:. 

I suspect that something is causing either a package, or R, to use the wrong drive. It _may_ be related to the fact that R itself is in its usual place in 'C:\Program files'.

Any pointers, either to an answer or to a better place to ask, would be welcome.

Steve Ellison

PS: I can see that there is a _fairly_ simple work-round, but I prefer Rtools where it is for system management reasons and this is (so far) the only place that the path variable is not correctly picked up. 



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