compiles on mac

src/pcsc.hxx

@@ -451,9 +451,6 @@ namespace pcsc {
           case SCARD_E_NO_MEMORY:
             ss<<"Not enough memory available to complete this command.";
             break;
-          case SCARD_E_NO_READERS_AVAILABLE:
-            ss<<"No smart card reader is available.";
-            break;
           case SCARD_E_NO_SERVICE:
             ss<<"The smart card resource manager is not running.";
             break;
@@ -532,6 +529,11 @@ namespace pcsc {
             ss<<"The reader cannot communicate with the smart card,"
               <<" due to ATR configuration conflicts.";
             break;
+#ifndef __APPLE__
+          case SCARD_E_NO_READERS_AVAILABLE:
+            ss<<"No smart card reader is available.";
+            break;
+#endif
 #ifdef WIN32
           case ERROR_BROKEN_PIPE:
             ss<<"The client attempted a smart card operation in a"