Building Redis 6.0.1 fails, because pthread_set_name_np() does not exist on NetBSD. You need to apply the following patch to fix building.
--- src/config.h.orig
+++ src/config.h
@@ -230,9 +230,12 @@ void setproctitle(const char *fmt, ...);
#ifdef __linux__
#define redis_set_thread_title(name) pthread_setname_np(pthread_self(), name)
#else
-#if (defined __NetBSD__ || defined __FreeBSD__ || defined __OpenBSD__)
+#if (defined __FreeBSD__ || defined __OpenBSD__)
#include <pthread_np.h>
#define redis_set_thread_title(name) pthread_set_name_np(pthread_self(), name)
+#elif defined __NetBSD__
+#include <pthread.h>
+#define redis_set_thread_title(name) pthread_setname_np(pthread_self(), name, NULL)
#else
#if (defined __APPLE__ && defined(MAC_OS_X_VERSION_10_7))
int pthread_setname_np(const char *name);
Comment From: antirez
Thank you @moubctez, fixed in unstable.