diff --git a/mach/pdp/libem/compmodule b/mach/pdp/libem/compmodule
new file mode 100755
index 000000000..e6e7c76e6
--- /dev/null
+++ b/mach/pdp/libem/compmodule
@@ -0,0 +1,4 @@
+if pdp -c $1 1>&2
+then echo `basename $1 $2`.o
+else exit 1
+fi