The default llvm/clang compiler on MacOS X 10.8 doesn't get 64-bit support with Rcpp because compilers.h is specifically looking for -std=c++0x as is required by some versions of gcc.
This is overly restrictive as e.g. __LP64__ platforms with _LONG_LONG_MAX set will also certainly have a suitable long long type. Patch attached or at : http://www.stokely.org/patches/compiler.int64.diff - Murray
compiler.int64.diff
Description: Binary data
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