/usr/include/json-c/json_config.h is in libjson-c-dev 0.11-3ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | /* json_config.h. Generated from json_config.h.in by configure. */
/* Define to 1 if you have the <inttypes.h> header file. */
#define JSON_C_HAVE_INTTYPES_H 1
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