Kenichi Handa <handa@m17n.org> writes:

>> That returns "-I/usr/include/freetype2" which is included
>> in ALL_CFLAGS.
>
> Strange.  Please send me your /usr/include/otf.h.

Without the comments it's only:

--8<---------------cut here---------------start------------->8---
#ifndef OTF_H
#define OTF_H

#include "OTF_Definitions.h"
#include "OTF_FileManager.h"
#include "OTF_Filenames.h"
#include "OTF_HandlerArray.h"
#include "OTF_MasterControl.h"
#include "OTF_RStream.h"
#include "OTF_Reader.h"
#include "OTF_WStream.h"
#include "OTF_Writer.h"

#endif /* OTF_H */
--8<---------------cut here---------------end--------------->8---

The complete file + the referenced headers are in this tarball.