NetBSD support. Thanks to Christoph Lohmann.
diff --git a/include/u.h b/include/u.h
index 54f4df5..84cd78d 100644
--- a/include/u.h
+++ b/include/u.h
@@ -8,6 +8,7 @@
#define __EXTENSIONS__ 1 /* SunOS */
/* NOT USING #define __MAKECONTEXT_V2_SOURCE 1 / * SunOS */
#define _BSD_SOURCE 1
+#define _NETBSD_SOURCE 1 /* NetBSD */
#define _SVID_SOURCE 1
#define _XOPEN_SOURCE 1000
#define _XOPEN_SOURCE_EXTENDED 1
@@ -74,6 +75,13 @@
# undef _NEEDUSHORT
# undef _NEEDUINT
# define _NEEDLL 1
+#elif defined(__NetBSD__)
+# include <sched.h>
+# include <sys/types.h>
+# undef _NEEDUSHORT
+# undef _NEEDUINT
+# undef _NEEDULONG
+# undef PLAN9PORT_USING_PTHREADS
#else
/* No idea what system this is -- try some defaults */
# include <pthread.h>
