Same problem. I've attached the entire R console log.
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Phil, what version of clang++ are you using?
Phillips-MacBook-Air:Boost pnprice$ clang -v
Apple LLVM version 6.1.0 (clang-602.0.49) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix
I'll try to recreate the issue on my end.I saw that error earlier this week, but it wasn't installing the current RStan -- it was when I was trying to do a custom build. Weird thing was I had that error for that custom RStan, but install RStan from the script worked fine.
Jiqiang is right: Mac's file system, by default, is not case sensitive, so you'll have to change it to something else.