This repository intention is to make the build system separate from the source code, which drops off the requirement of every library refactoring and embedding the CMake into every submodule.
First of all, obviously, boost and boost_cmake sources repository are required.
Then configure the CMake project telling where actual sources are located.
git clone --recurse-submodules https://github.com/boostorg/boost.git
git clone --recurse-submodules https://github.com/BoostCMake/boost_cmake.git
mkdir build && cd build && cmake -DBUILD_WITH_SOURCES_DIR=../boost ../boost_cmake
Supported Boost versions are now: 1.58.0, 1.59.0, 1.60.0, 1.61.0
More versions are coming with more interest.