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/usr/include/x86_64-linux-gnu/jconfig.h is in libjpeg9-dev 1:9b-2.

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The actual contents of the file can be viewed below.

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

/* Define "boolean" as unsigned char, not int, on Windows systems. */
#ifdef _WIN32
#ifndef __RPCNDR_H__		/* don't conflict if rpcndr.h already read */
typedef unsigned char boolean;
#endif
#define HAVE_BOOLEAN		/* prevent jmorecfg.h from redefining it */
#endif

#ifdef JPEG_INTERNALS

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