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Having an old Intel Core Duo MacBook with Snow Leopard, when I try to compile using g++ and the input parameter std=c++0x I get:
cc1plus: error: unrecognized command line option "-std=c++0x"
Any ideas of how to fix this?
c++0x / c++11 support has only been added starting with gcc v4.3, see this page to check what c++ feature has been added in what gcc version.
Alternatively you could use the clang++ compiler, which also comes standard with XCode. See this page for version info.
Or install gcc47 from macports
Btw, better use
-std=c++11, thec++0xoption is not supported by clang.