role_type is in boost/beast/core/role.hpp (API Change):

This enumeration is now part of the library core and
not specific to websocket.

example/websocket/client/async-ssl/websocket_client_async_ssl.cpp

@@ -129,7 +129,7 @@ public:
         // Set suggested timeout settings for the websocket
         ws_.set_option(
             websocket::stream_base::suggested_settings(
-                websocket::role_type::client));
+                beast::role_type::client));
 
         // Set a decorator to change the User-Agent of the handshake
         ws_.set_option(websocket::stream_base::decorator(

example/websocket/client/async/websocket_client_async.cpp

@@ -106,7 +106,7 @@ public:
         // Set suggested timeout settings for the websocket
         ws_.set_option(
             websocket::stream_base::suggested_settings(
-                websocket::role_type::client));
+                beast::role_type::client));
 
         // Set a decorator to change the User-Agent of the handshake
         ws_.set_option(websocket::stream_base::decorator(

example/websocket/client/coro-ssl/websocket_client_coro_ssl.cpp

@@ -95,7 +95,7 @@ do_session(
     // Set suggested timeout settings for the websocket
     ws.set_option(
         websocket::stream_base::suggested_settings(
-            websocket::role_type::client));
+            beast::role_type::client));
 
     // Perform the websocket handshake
     ws.async_handshake(host, "/", yield[ec]);

example/websocket/client/coro/websocket_client_coro.cpp

@@ -71,7 +71,7 @@ do_session(
     // Set suggested timeout settings for the websocket
     ws.set_option(
         websocket::stream_base::suggested_settings(
-            websocket::role_type::client));
+            beast::role_type::client));
 
     // Set a decorator to change the User-Agent of the handshake
     ws.set_option(websocket::stream_base::decorator(