$OpenBSD$

Index: libnetdata/threads/threads.c
--- libnetdata/threads/threads.c.orig
+++ libnetdata/threads/threads.c
@@ -30,7 +30,7 @@ pid_t gettid(void) {
 
     return (pid_t)pthread_getthreadid_np();
 
-#elif defined(__APPLE__)
+#elif defined(__APPLE__) || defined(__OpenBSD__)
 
     #if (defined __MAC_OS_X_VERSION_MIN_REQUIRED && __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060)
         uint64_t curthreadid;
