> cmake -H. -B_builds -DBOOST_ROOT=/my/path/to/boost -DCMAKE_VERBOSE_MAKEFILE=ON
-- Boost version: 1.55.0
-- Found the following Boost libraries:
--   system
x: /my/path/to/boost/include
y: /my/path/to/boost/lib/libboost_system-mt.so
> cmake --build _builds/
clang++ ... -rdynamic /my/path/to/boost/lib/lib/libboost_system-mt.so -Wl,-rpath,/my/path/to/boost/lib/
> ldd _builds/foo
libboost_system-mt.so.1.55.0 => /my/path/to/boost/lib/libboost_system-mt.so.1.55.0 (0x00007fb035e15000)