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

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#ifndef _UCONTEXT_H
#define _UCONTEXT_H
#ifdef __cplusplus
extern "C" {
#endif

#include <features.h>

#include <signal.h>

#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
#define NGREG (sizeof(gregset_t)/sizeof(greg_t))
#endif

struct __ucontext;

int  getcontext(struct __ucontext *);
void makecontext(struct __ucontext *, void (*)(void), int, ...);
int  setcontext(const struct __ucontext *);
int  swapcontext(struct __ucontext *, const struct __ucontext *);

#ifdef __cplusplus
}
#endif
#endif