no stdint
diff --git a/include/u.h b/include/u.h
index e5aeae5..0a696ce 100644
--- a/include/u.h
+++ b/include/u.h
@@ -10,14 +10,14 @@
#define _BSD_SOURCE 1
#define _NETBSD_SOURCE 1 /* NetBSD */
#define _SVID_SOURCE 1
-#ifndef __APPLE__
+#if !defined(__APPLE__) && !defined(__OpenBSD__)
# define _XOPEN_SOURCE 1000
# define _XOPEN_SOURCE_EXTENDED 1
#endif
#define _LARGEFILE64_SOURCE 1
#define _FILE_OFFSET_BITS 64
-#include <stdint.h>
+#include <inttypes.h>
#include <unistd.h>
#include <string.h>
@@ -95,9 +95,11 @@
# undef _NEEDULONG
#elif defined(__OpenBSD__)
# include <sys/types.h>
+# include <pthread.h>
# undef _NEEDUSHORT
# undef _NEEDUINT
# undef _NEEDULONG
+# define PLAN9PORT_USING_PTHREADS 1
#else
/* No idea what system this is -- try some defaults */
# include <pthread.h>
