Index: boost/asio/impl/serial_port_base.ipp
===================================================================
--- boost/asio/impl/serial_port_base.ipp	(revision 65217)
+++ boost/asio/impl/serial_port_base.ipp	(working copy)
@@ -253,12 +253,16 @@
     storage.c_iflag &= ~(IXOFF | IXON);
 # if defined(_BSD_SOURCE)
     storage.c_cflag &= ~CRTSCTS;
+# elif defined(__QNXNTO__)
+    storage.c_cflag &= ~(IHFLOW | OHFLOW);
 # endif
     break;
   case software:
     storage.c_iflag |= IXOFF | IXON;
 # if defined(_BSD_SOURCE)
     storage.c_cflag &= ~CRTSCTS;
+# elif defined(__QNXNTO__)
+    storage.c_cflag &= ~(IHFLOW | OHFLOW);
 # endif
     break;
   case hardware:
@@ -266,6 +270,10 @@
     storage.c_iflag &= ~(IXOFF | IXON);
     storage.c_cflag |= CRTSCTS;
     break;
+# elif defined(__QNXNTO__)
+    storage.c_iflag &= ~(IXOFF | IXON);
+    storage.c_cflag |= (IHFLOW | OHFLOW);
+    break;
 # else
     ec = boost::asio::error::operation_not_supported;
     return ec;
@@ -304,6 +312,11 @@
   {
     value_ = hardware;
   }
+# elif defined(__QNXNTO__)
+  else if (storage.c_cflag & IHFLOW && storage.c_cflag & OHFLOW)
+  {
+    value_ = hardware;
+  }
 # endif
   else
   {