/usr/include/wx-3.0/wx/unix/evtloopsrc.h is in wx3.0-headers 3.0.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Name:        wx/unix/evtloopsrc.h
// Purpose:     wxUnixEventLoopSource class
// Author:      Vadim Zeitlin
// Created:     2009-10-21
// Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_UNIX_EVTLOOPSRC_H_
#define _WX_UNIX_EVTLOOPSRC_H_
class wxFDIODispatcher;
class wxFDIOHandler;
// ----------------------------------------------------------------------------
// wxUnixEventLoopSource: wxEventLoopSource for Unix-like toolkits using fds
// ----------------------------------------------------------------------------
class wxUnixEventLoopSource : public wxEventLoopSource
{
public:
    // dispatcher and fdioHandler are only used here to allow us to unregister
    // from the event loop when we're destroyed
    wxUnixEventLoopSource(wxFDIODispatcher *dispatcher,
                          wxFDIOHandler *fdioHandler,
                          int fd,
                          wxEventLoopSourceHandler *handler,
                          int flags)
        : wxEventLoopSource(handler, flags),
          m_dispatcher(dispatcher),
          m_fdioHandler(fdioHandler),
          m_fd(fd)
    {
    }
    virtual ~wxUnixEventLoopSource();
private:
    wxFDIODispatcher * const m_dispatcher;
    wxFDIOHandler * const m_fdioHandler;
    const int m_fd;
    wxDECLARE_NO_COPY_CLASS(wxUnixEventLoopSource);
};
#endif // _WX_UNIX_EVTLOOPSRC_H_
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