@@ -23,7 +23,12 @@
#include <jvalidate/forward.h>
#define CONSTRUCTS(TYPE) format::ctor_as_valid<detail::TYPE>
+
+#ifdef JVALIDATE_HAS_IDNA
#define UTF32(FN) format::utf32<format::FN<char32_t>>
+#else
+#define UTF32(FN) nullptr
+#endif
namespace jvalidate::format::detail {
struct result {
