Compilation errors in qwaylanddatacontrolv1.cpp due to incomplete type definitions and undeclared identifiers.

/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp: In member function ‘virtual void QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)’:
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:26: error: aggregate ‘QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction action’ has incomplete type and cannot be defined
  148 |         struct sigaction action, oldAction;
      |                          ^~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:34: error: aggregate ‘QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction oldAction’ has incomplete type and cannot be defined
  148 |         struct sigaction action, oldAction;
      |                                  ^~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:149:29: error: ‘SIG_IGN’ was not declared in this scope
  149 |         action.sa_handler = SIG_IGN;
      |                             ^~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:150:9: error: ‘sigemptyset’ was not declared in this scope
  150 |         sigemptyset (&action.sa_mask);
      |         ^~~~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:153:19: error: ‘SIGPIPE’ was not declared in this scope; did you mean ‘EPIPE’?
  153 |         sigaction(SIGPIPE, &action, &oldAction);
      |                   ^~~~~~~
      |                   EPIPE
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:153:47: error: invalid use of incomplete type ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  153 |         sigaction(SIGPIPE, &action, &oldAction);
      |                                               ^
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:16: note: forward declaration of ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  148 |         struct sigaction action, oldAction;
      |                ^~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:154:26: error: ‘write’ was not declared in this scope; did you mean ‘fwrite’?
  154 |         ssize_t unused = write(fd, content.constData(), size_t(content.size()));
      |                          ^~~~~
      |                          fwrite
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:156:47: error: invalid use of incomplete type ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  156 |         sigaction(SIGPIPE, &oldAction, nullptr);
      |                                               ^
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:16: note: forward declaration of ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  148 |         struct sigaction action, oldAction;
      |                ^~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:158:5: error: ‘close’ was not declared in this scope; did you mean ‘pclose’?
  158 |     close(fd);
      |     ^~~~~
      |     pclose
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/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp: In member function ‘virtual void QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)’:
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:26: error: aggregate ‘QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction action’ has incomplete type and cannot be defined
  148 |         struct sigaction action, oldAction;
      |                          ^~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:34: error: aggregate ‘QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction oldAction’ has incomplete type and cannot be defined
  148 |         struct sigaction action, oldAction;
      |                                  ^~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:149:29: error: ‘SIG_IGN’ was not declared in this scope
  149 |         action.sa_handler = SIG_IGN;
      |                             ^~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:150:9: error: ‘sigemptyset’ was not declared in this scope
  150 |         sigemptyset (&action.sa_mask);
      |         ^~~~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:153:19: error: ‘SIGPIPE’ was not declared in this scope; did you mean ‘EPIPE’?
  153 |         sigaction(SIGPIPE, &action, &oldAction);
      |                   ^~~~~~~
      |                   EPIPE
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:153:47: error: invalid use of incomplete type ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  153 |         sigaction(SIGPIPE, &action, &oldAction);
      |                                               ^
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:16: note: forward declaration of ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  148 |         struct sigaction action, oldAction;
      |                ^~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:154:26: error: ‘write’ was not declared in this scope; did you mean ‘fwrite’?
  154 |         ssize_t unused = write(fd, content.constData(), size_t(content.size()));
      |                          ^~~~~
      |                          fwrite
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:156:47: error: invalid use of incomplete type ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  156 |         sigaction(SIGPIPE, &oldAction, nullptr);
      |                                               ^
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:148:16: note: forward declaration of ‘struct QtWaylandClient::QWaylandDataControlSourceV1::zwlr_data_control_source_v1_send(const QString&, int32_t)::sigaction’
  148 |         struct sigaction action, oldAction;
      |                ^~~~~~~~~
/home/qt/work/qt/qtwayland/src/client/qwaylanddatacontrolv1.cpp:158:5: error: ‘close’ was not declared in this scope; did you mean ‘pclose’?
  158 |     close(fd);
      |     ^~~~~
      |     pclose