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/usr/include/x86_64-linux-musl/sys/un.h is in musl-dev 0.9.15-1.

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#ifndef	_SYS_UN_H
#define	_SYS_UN_H

#ifdef __cplusplus
extern "C" {
#endif

#include <features.h>

#define __NEED_sa_family_t
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define __NEED_size_t
#endif

#include <bits/alltypes.h>

struct sockaddr_un
{
	sa_family_t sun_family;
	char sun_path[108];
};

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
size_t strlen(const char *);
#define SUN_LEN(s) (2+strlen((s)->sun_path))
#endif

#ifdef __cplusplus
}
#endif

#endif