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/usr/include/chemio.h is in libga-dev 5.3+dfsg-1.

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#if !defined(CHEMIO_H)
#define CHEMIO_H

#define   ELIO_RW  -1
#define   ELIO_W   -2
#define   ELIO_R   -3

#define   ELIO_DONE    -1
#define   ELIO_PENDING  1
#define   ELIO_OK       0

#define   CHEMIO_RW      ELIO_RW
#define   CHEMIO_W       ELIO_W 
#define   CHEMIO_R       ELIO_R 
#define   CHEMIO_DONE    ELIO_DONE   
#define   CHEMIO_PENDING ELIO_PENDING 
#define   CHEMIO_OK      ELIO_OK 

#endif