diff --git a/mps/src/prmcfr.h b/mps/src/prmcfr.h
new file mode 100644
index 00000000000..477875303bc
--- /dev/null
+++ b/mps/src/prmcfr.h
@@ -0,0 +1,26 @@
+/* impl.h.prmcli:  PROTECTION MUTATOR CONTEXT (Linux)
+ *
+ * $HopeName: $
+ * Copyright (C) 1998 The Harlequin Group Limited.  All rights reserved.
+ *
+ * .readership: MPS developers.
+ */
+
+#ifndef prmcli_h
+#define prmcli_h
+
+
+/* open sesame magic */
+#define _BSD_SOURCE 1
+#define _POSIX_C_SOURCE 1
+
+#include "mpm.h"
+
+#include <signal.h>
+
+typedef struct MutatorFaultContextStruct { /* Protection fault context data */
+  struct sigcontext *scp;                   /* Linux sigcontext */
+} MutatorFaultContextStruct;
+
+
+#endif /* prmcli_h */