--- /dev/null
+#ifndef __LUNALIBC_SYS_LUNAIX_H
+#define __LUNALIBC_SYS_LUNAIX_H
+
+#include <sys/types.h>
+#include <stddef.h>
+
+void
+yield();
+
+void
+syslog(int level, const char* fmt, ...);
+
+int
+realpathat(int fd, char* buf, size_t size);
+
+#endif /* __LUNALIBC_LUNAIX_H */