Building Lirch

As stated in the README, Lirch's core leverages C++11 features.

I was able to build Lirch on a system as far back as Ubuntu 10.04, with gcc 4.6.0.

If you're using a gcc older than this: sorry, no dice. (My build was released 3/25/2011.)

Any build problems on *nix should be reported here, with potential results.

error: ‘sleep_for’ is not a member of ‘std::this_thread’

Try adding -D_GLIBCXX_USE_NANOSLEEP to your CMAKE_CXX_FLAGS