utilities for font rederering as well as text rendering
...
# GLM: opengl mathematics
include_directories(external_libraries/glm)
add_subdirectory(external_libraries/glm)
# FreeType: font rendering
add_subdirectory(external_libraries/freetype)
include_directories(external_libraries/freetype/include)
...
target_link_libraries(your_project_name ... freetype)