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/usr/include/jconfig.h is in libjpeg62-dev 6b1-2ubuntu1.

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/* jconfig.h.  Generated from jconfig.cfg by configure.  */
/* jconfig.cfg --- source file edited by configure script */
/* see jconfig.doc for explanations */

#define HAVE_PROTOTYPES 1
#define HAVE_UNSIGNED_CHAR 1
#define HAVE_UNSIGNED_SHORT 1
/* #undef void */
/* #undef const */
/* #undef CHAR_IS_UNSIGNED */


/* #undef NEED_BSD_STRINGS */
/* #undef NEED_SYS_TYPES_H */
/* #undef NEED_FAR_POINTERS */
/* #undef NEED_SHORT_EXTERNAL_NAMES */
/* Define this if you get warnings about undefined structures. */
/* #undef INCOMPLETE_TYPES_BROKEN */

#ifdef JPEG_INTERNALS

/* #undef RIGHT_SHIFT_IS_UNSIGNED */
#define INLINE __inline__
/* These are for configuring the JPEG memory manager. */
#define DEFAULT_MAX_MEM 1073741824
/* #undef NO_MKTEMP */

#endif /* JPEG_INTERNALS */

#ifdef JPEG_CJPEG_DJPEG

#define BMP_SUPPORTED		/* BMP image file format */
#define GIF_SUPPORTED		/* GIF image file format */
#define PPM_SUPPORTED		/* PBMPLUS PPM/PGM image file format */
/* #undef RLE_SUPPORTED */
#define TARGA_SUPPORTED		/* Targa image file format */

/* #undef TWO_FILE_COMMANDLINE */
/* #undef NEED_SIGNAL_CATCHER */
/* #undef DONT_USE_B_MODE */

/* Define this if you want percent-done progress reports from cjpeg/djpeg. */
/* #undef PROGRESS_REPORT */

#endif /* JPEG_CJPEG_DJPEG */