Index: src/modules/module-pipe-tunnel.c
--- src/modules/module-pipe-tunnel.c.orig
+++ src/modules/module-pipe-tunnel.c
@@ -16,6 +16,10 @@
 #include <limits.h>
 #include <math.h>
 
+#if defined(__OpenBSD__)
+#include <sys/uio.h>
+#endif
+
 #include "config.h"
 
 #include <spa/utils/result.h>
