I did what you did, Charles, but got:
C:\Users\win7\AppData\Local\Temp\ccDMV70q.s: Assembler messages: C:\Users\win7\AppData\Local\Temp\ccDMV70q.s: Fatal error: can't close lang__grammars__statement_grammar_inst.o: File too big make: *** [C:/PROGRA~1/R/R-35~1.1/etc/i386/Makeconf:215: lang__grammars__statement_grammar_inst.o] Error 1 ERROR: compilation failed for package 'rstan'
I’m on Windows 7, though. (I know this is a thread for Windows 10, but I didn’t want to start a new thread.) Anyone got any ideas?
EDIT
As @bgoodri correctly pointed out below, I missed something in Makevars. Anyone with the same problem, check out this. I also had to reinstall Rtools and (manually) add C:\Rtools\mingw_64\bin, just as @Charles_Driver pointed out. But now I get the error message that Paul mentions in the first post. I’ll try the binary install…