1 files changed, 11 insertions, 4 deletions
diff --git a/machxo2/arch.h b/machxo2/arch.h
index 7a22dd91..15535fe1 100644
--- a/machxo2/arch.h
+++ b/machxo2/arch.h
@@ -18,9 +18,14 @@
  *
  */
 
-#ifndef NEXTPNR_H
-#error Include "arch.h" via "nextpnr.h" only.
-#endif
+#ifndef MACHXO2_ARCH_H
+#define MACHXO2_ARCH_H
+
+#include <cstdint>
+
+#include "base_arch.h"
+#include "nextpnr_namespaces.h"
+#include "nextpnr_types.h"
 
 NEXTPNR_NAMESPACE_BEGIN
 
@@ -37,7 +42,7 @@ template <typename T> struct RelPtr
 
     const T *get() const { return reinterpret_cast<const T *>(reinterpret_cast<const char *>(this) + offset); }
 
-    const T &operator[](size_t index) const { return get()[index]; }
+    const T &operator[](std::size_t index) const { return get()[index]; }
 
     const T &operator*() const { return *(get()); }
 
@@ -684,3 +689,5 @@ struct Arch : BaseArch<ArchRanges>
 };
 
 NEXTPNR_NAMESPACE_END
+
+#endif /* MACHXO2_ARCH_H */