--- include/pub_tool_libcfile.h.orig
+++ include/pub_tool_libcfile.h
@@ -69,6 +69,9 @@
    ULong   ctime_nsec;
 };
 
+#if defined(VGO_openbsd)
+extern SysRes VG_(mkfifo)  ( const HChar* pathname, Int mode );
+#endif
 extern SysRes VG_(mknod)  ( const HChar* pathname, Int mode, UWord dev );
 extern SysRes VG_(open)   ( const HChar* pathname, Int flags, Int mode );
 /* fd_open words like the open(2) system call: