Did some work checking the build on OSX. Looks like clang 14 is too old, will try later version.

lel.hpp

@@ -3,6 +3,7 @@
 #include <unordered_map>
 #include <functional>
 #include <optional>
+#include <vector>
 
 namespace lel {
   using Row = std::vector<std::string>;