Ok, I think I may have a path or permissions problem (below).  Anyone know which settings I should check?    

When I use 

"Rcmd SHLIB <filename>"

I get:  

C:\Program Files\R\rw1081\bin>Rcmd SHLIB info.diffusion.c
process_begin: CreateProcess((null), dlltool -k --as as --dllname R.dll --def R.
exp --output-lib libR.a, ...) failed.
make (e=2): The system cannot find the file specified.
make[1]: *** [libR.a] Error 2
make: *** [libR] Error 2
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