pin
diff --git a/src/lib9/mkfile b/src/lib9/mkfile
index 143ca7d..ca61543 100644
--- a/src/lib9/mkfile
+++ b/src/lib9/mkfile
@@ -128,6 +128,7 @@
 	nulldir.$O\
 	open.$O\
 	opentemp.$O\
+	pin.$O\
 	pipe.$O\
 	post9p.$O\
 	postnote.$O\
diff --git a/src/lib9/pin.c b/src/lib9/pin.c
new file mode 100644
index 0000000..3b15d3b
--- /dev/null
+++ b/src/lib9/pin.c
@@ -0,0 +1,11 @@
+#include <u.h>
+#include <libc.h>
+
+static void
+nop(void)
+{
+}
+
+void (*_pin)(void) = nop;
+void (*_unpin)(void) = nop;
+