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FreeType's header inclusion scheme


To be as flexible as possible (and for historical reasons), FreeType uses a very special inclusion scheme to load header files, for example

  #include <ft2build.h>

  #include FT_FREETYPE_H
  #include FT_OUTLINE_H

A compiler and its preprocessor only needs an include path to find the file ft2build.h; the exact locations and names of the other FreeType header files are hidden by ‘Header File Macros’, loaded by ft2build.h. The API documentation always gives the header macro name needed for a particular function.