diff --git a/include/geometry.h b/include/geometry.h
index 274d5b0..a5bcb9c 100644
--- a/include/geometry.h
+++ b/include/geometry.h
@@ -59,7 +59,7 @@
 Quaternion qsub(Quaternion, Quaternion);
 Quaternion qneg(Quaternion);
 Quaternion qmul(Quaternion, Quaternion);
-Quaternion qdiv(Quaternion, Quaternion);
+Quaternion p9qdiv(Quaternion, Quaternion);
 Quaternion qunit(Quaternion);
 Quaternion qinv(Quaternion);
 double qlen(Quaternion);
@@ -94,6 +94,11 @@
 Point3 xformpointd(Point3, Space *, Space *);
 Point3 xformplane(Point3, Space *, Space *);
 #define	radians(d)	((d)*.01745329251994329572)
+
+#ifndef NOPLAN9DEFINES
+#define	qdiv	p9qdiv	/* for NetBSD */
+#endif
+
 #if defined(__cplusplus)
 }
 #endif
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>