diff --git a/gcc/config/romp/x-mach b/gcc/config/romp/x-mach
new file mode 100644
index 00000000000..a181e1bbbce
--- /dev/null
+++ b/gcc/config/romp/x-mach
@@ -0,0 +1,5 @@
+# Ensure that CPATH is used and suppress lots of warnings.
+CC=hc2 -Hcpp -w
+
+# The default `make' on the RT doesn't define MAKE, so do it here.
+MAKE=make