diff --git a/mach/ns/libpc/compmodule b/mach/ns/libpc/compmodule
new file mode 100755
index 00000000..846ba6f1
--- /dev/null
+++ b/mach/ns/libpc/compmodule
@@ -0,0 +1,4 @@
+if ${MACH?ack} -I../../../h ${MACHFL?} $1 1>&2
+then echo `basename $1 $2`.o
+else exit 1
+fi