How to add include directories in CMake

It is common in many setups to have additional include directories that need to be used during compilation of C, C++ or CUDA code. These can be both global or relative local directories. Adding include directories to all targets or specific targets is easy in CMake.

• The directive to add include directories for all targets being compiled by CMake is include_directories. For example, add this to CMakeLists.txt:

include_directories(
    /usr/local/flac
    include
    src
    )

• The directive to add include directories for a particular target being compiled by CMake is target_include_directories. For example, add this to CMakeLists.txt to compile the target foobar:

target_include_directories(
    foobar PUBLIC
    /usr/local/flac
    include
    src
    )

Tried with: CMake 2.8.7 and Ubuntu 14.04