title: Cmake build directory
body: <p>After running cmake/make for my own project, I noticed cmake puts object files into a directory named <code>CMakeFiles/myproject.dir/</code>. How can I set a different build directory (e.g. <code>bin/)</code>? I know of the variables <code>CMAKE_BINARY_DIR</code> or <code>CMAKE_CURRENT_BINARY_DIR</code>, but they are supposed to be read-only.</p>