/usr/include/mrbconf.h is in libmruby-dev 0.0.0~20131214+git882afdea-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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** mrbconf.h - mruby core configuration
**
** See Copyright Notice in mruby.h
*/
#ifndef MRUBYCONF_H
#define MRUBYCONF_H
/* configuration options: */
/* add -DMRB_USE_FLOAT to use float instead of double for floating point numbers */
//#define MRB_USE_FLOAT
/* add -DMRB_INT16 to use 16bit integer for mrb_int; conflict with MRB_INT64 */
//#define MRB_INT16
/* add -DMRB_INT64 to use 64bit integer for mrb_int; conflict with MRB_INT16 */
//#define MRB_INT64
/* represent mrb_value in boxed double; conflict with MRB_USE_FLOAT */
//#define MRB_NAN_BOXING
/* define on big endian machines; used by MRB_NAN_BOXING */
//#define MRB_ENDIAN_BIG
/* represent mrb_value as a word (natural unit of data for the processor) */
// #define MRB_WORD_BOXING
/* argv max size in mrb_funcall */
//#define MRB_FUNCALL_ARGC_MAX 16
/* number of object per heap page */
//#define MRB_HEAP_PAGE_SIZE 1024
/* use segmented list for IV table */
//#define MRB_USE_IV_SEGLIST
/* initial size for IV khash; ignored when MRB_USE_IV_SEGLIST is set */
//#define MRB_IVHASH_INIT_SIZE 8
/* initial size for IREP array */
//#define MRB_IREP_ARRAY_INIT_SIZE (256u)
/* turn off generational GC by default */
//#define MRB_GC_TURN_OFF_GENERATIONAL
/* default size of khash table bucket */
//#define KHASH_DEFAULT_SIZE 32
/* allocated memory address alignment */
//#define POOL_ALIGNMENT 4
/* page size of memory pool */
//#define POOL_PAGE_SIZE 16000
/* initial minimum size for string buffer */
//#define MRB_STR_BUF_MIN_SIZE 128
/* arena size */
//#define MRB_GC_ARENA_SIZE 100
/* fixed size GC arena */
//#define MRB_GC_FIXED_ARENA
/* -DDISABLE_XXXX to drop following features */
//#define DISABLE_STDIO /* use of stdio */
/* -DENABLE_XXXX to enable following features */
//#define ENABLE_DEBUG /* hooks for debugger */
/* end of configuration */
/* define ENABLE_XXXX from DISABLE_XXX */
#ifndef DISABLE_STDIO
#define ENABLE_STDIO
#endif
#ifndef ENABLE_DEBUG
#define DISABLE_DEBUG
#endif
#ifdef ENABLE_STDIO
# include <stdio.h>
#endif
#ifndef FALSE
# define FALSE 0
#endif
#ifndef TRUE
# define TRUE 1
#endif
#endif /* MRUBYCONF_H */
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