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/usr/include/x86_64-linux-musl/fmtmsg.h is in musl-dev 1.1.19-1.

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The actual contents of the file can be viewed below.

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#ifndef _FMTMSG_H
#define _FMTMSG_H

#ifdef __cplusplus
extern "C" {
#endif

#define MM_HARD		1
#define MM_SOFT		2
#define MM_FIRM		4

#define MM_APPL		8
#define MM_UTIL		16
#define MM_OPSYS	32

#define MM_RECOVER	64
#define MM_NRECOV	128

#define MM_PRINT	256
#define MM_CONSOLE	512

#define MM_NULLMC	0L

#define MM_HALT		1
#define MM_ERROR	2
#define MM_WARNING	3
#define MM_INFO		4
#define MM_NOSEV	0

#define MM_OK		0
#define MM_NOTOK	(-1)
#define MM_NOMSG	1
#define MM_NOCON	4

#define MM_NULLLBL	((char*)0)
#define MM_NULLTXT	((char*)0)
#define MM_NULLACT	((char*)0)
#define MM_NULLTAG	((char*)0)
#define MM_NULLSEV	0

int fmtmsg(long, const char *, int, const char *, const char *, const char *);

#ifdef __cplusplus
}
#endif

#endif