Directory structure for CMake library projects

I have an application project Demo

that depends on my shared library Hello

. The library Hello

must be redistributable. So I need to distribute Hello headers and also use it in my demo projects. What directory structure and CMake configuration should I use? I used to have a flat structure and Hello

only a header subdirectory without CMakeLists.txt. I am now planning this directory structure.

Demo
    main.cpp
    app.h
    app.cpp
    CMakeLists.txt
    Hello
       includes
           matrix.hpp          // header only
           diagonal.hpp
           point.hpp
           store.h
           analyzer.h
       sources
           store.cpp
           alanyzer.cpp
       CMakeLists.txt

      

        
        
        
      

    

Previously, the parser was just a title, which is now broken down into title and source. I only mix titles. Is this a good structure? But I prefer to use nice #include <Hallo/matrix.hpp>

not ugly #include "Hallo/includes/matrix.hpp"

or simple #include "matrix.hpp"

. I expect this library to Hello

be used for other applications and libraries as well.

Demo/CMakeList.txt

CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
PROJECT(Demo)
ADD_SUBDIRECTORY(Demo)

SET(Demo_HEADERS
  app.h
)

SET(Demo_SOURCES
  app.cpp
  main.cpp
)

INCLUDE_DIRECTORIES(${Hello_INCLUDE_DIRS})
# ^^^^ Is this how I need to access the headers ? or just ADD_SUBDIRECTORY() will work

ADD_EXECUTABLE(Demo ${Demo_SOURCES} ${Demo_HEADERS})

TARGET_LINK_LIBRARIES(Demo Hello)

      

        
        
        
      

    

Hello / CMakeLists.txt

CMAKE_MINIMUM_REQUIRED(VERSION 2.6)
PROJECT(Hello)

FIND_PACKAGE(Boost COMPONENTS filesystem program_options thread system serialization date_time chrono REQUIRED)

INCLUDE_DIRECTORIES(${Boost_INCLUDE_DIRS})

SET(Hello_SOURCES
  store.cpp
  analyzer.cpp
)

INCLUDE_DIRECTORIES((${HELLO_SOURCE_DIR}/includes)
# ^^^^ Is this how I need to access the headers ?

ADD_LIBRARY(Hello ${Hello_SOURCES})

TARGET_LINK_LIBRARIES(Hello ${Boost_LIBRARIES})

      

        
        
        
      

    

I'm a little confused with all of this since there is no specific way to do all of this.

--- EDIT ---

Should I have this structure? Or do some other libraries usually use this structure? or what structures are commonly practiced?

hallo
  includes
    hallo
  sources