diff --git a/lisp/hpux-os.h b/lisp/hpux-os.h
new file mode 100644
index 0000000000000000000000000000000000000000..fd947ed3e5e61d68446ccef4e2dfe3cb75d813e1
--- /dev/null
+++ b/lisp/hpux-os.h
@@ -0,0 +1,12 @@
+#include <sys/mman.h>
+
+typedef caddr_t os_vm_address_t;
+typedef size_t os_vm_size_t;
+typedef off_t os_vm_offset_t;
+typedef int os_vm_prot_t;
+
+#define OS_VM_PROT_READ PROT_READ
+#define OS_VM_PROT_WRITE PROT_WRITE
+#define OS_VM_PROT_EXECUTE PROT_EXEC
+
+#define OS_VM_DEFAULT_PAGESIZE	4096