This library is a C++ template library and, as such, there is no
library to build and install.  Copy the .h files and use them!
See https://code.google.com/p/cpp-btree/wiki/UsageInstructions for
details.
----
To build and run the provided tests, however, you will need to install
CMake, the Google C++ Test framework, and the Google flags package.
Download and install CMake from https://www.cmake.org
Download and build the GoogleTest framework from
https://code.google.com/p/googletest
Download and install gflags from https://code.google.com/p/gflags
Set GTEST_ROOT to the directory where GTEST was built.
Set GFLAGS_ROOT to the directory prefix where GFLAGS is installed.
export GTEST_ROOT=/path/for/gtest-x.y
export GFLAGS_ROOT=/opt
cmake . -Dbuild_tests=ON
For example, to build on a Unix system with the clang++ compiler,
export GTEST_ROOT=$(HOME)/src/googletest
export GFLAGS_ROOT=/opt
cmake . -G "Unix Makefiles" -Dbuild_tests=ON -DCMAKE_CXX_COMPILER=clang++