/usr/include/wx-3.0/wx/gtk/toolbar.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/gtk/toolbar.h
// Purpose:     GTK toolbar
// Author:      Robert Roebling
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_GTK_TOOLBAR_H_
#define _WX_GTK_TOOLBAR_H_
#if wxUSE_TOOLBAR
typedef struct _GtkTooltips GtkTooltips;
// ----------------------------------------------------------------------------
// wxToolBar
// ----------------------------------------------------------------------------
class WXDLLIMPEXP_CORE wxToolBar : public wxToolBarBase
{
public:
    // construction/destruction
    wxToolBar() { Init(); }
    wxToolBar( wxWindow *parent,
               wxWindowID id,
               const wxPoint& pos = wxDefaultPosition,
               const wxSize& size = wxDefaultSize,
               long style = wxTB_HORIZONTAL,
               const wxString& name = wxToolBarNameStr )
    {
        Init();
        Create(parent, id, pos, size, style, name);
    }
    bool Create( wxWindow *parent,
                 wxWindowID id,
                 const wxPoint& pos = wxDefaultPosition,
                 const wxSize& size = wxDefaultSize,
                 long style = wxTB_HORIZONTAL,
                 const wxString& name = wxToolBarNameStr );
    virtual ~wxToolBar();
    virtual wxToolBarToolBase *FindToolForPosition(wxCoord x, wxCoord y) const;
    virtual void SetToolShortHelp(int id, const wxString& helpString);
    virtual void SetWindowStyleFlag( long style );
    virtual void SetToolNormalBitmap(int id, const wxBitmap& bitmap);
    virtual void SetToolDisabledBitmap(int id, const wxBitmap& bitmap);
    virtual bool Realize();
    static wxVisualAttributes
    GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
    virtual wxToolBarToolBase *CreateTool(int id,
                                          const wxString& label,
                                          const wxBitmap& bitmap1,
                                          const wxBitmap& bitmap2 = wxNullBitmap,
                                          wxItemKind kind = wxITEM_NORMAL,
                                          wxObject *clientData = NULL,
                                          const wxString& shortHelpString = wxEmptyString,
                                          const wxString& longHelpString = wxEmptyString);
    virtual wxToolBarToolBase *CreateTool(wxControl *control,
                                          const wxString& label);
    // implementation from now on
    // --------------------------
protected:
    // choose the default border for this window
    virtual wxBorder GetDefaultBorder() const { return wxBORDER_DEFAULT; }
    virtual wxSize DoGetBestSize() const;
    virtual GdkWindow *GTKGetWindow(wxArrayGdkWindows& windows) const;
    // implement base class pure virtuals
    virtual bool DoInsertTool(size_t pos, wxToolBarToolBase *tool);
    virtual bool DoDeleteTool(size_t pos, wxToolBarToolBase *tool);
    virtual void DoEnableTool(wxToolBarToolBase *tool, bool enable);
    virtual void DoToggleTool(wxToolBarToolBase *tool, bool toggle);
    virtual void DoSetToggle(wxToolBarToolBase *tool, bool toggle);
private:
    void Init();
    void GtkSetStyle();
    GSList* GetRadioGroup(size_t pos);
    virtual void AddChildGTK(wxWindowGTK* child);
    GtkToolbar* m_toolbar;
    GtkTooltips* m_tooltips;
    DECLARE_DYNAMIC_CLASS(wxToolBar)
};
#endif // wxUSE_TOOLBAR
#endif
    // _WX_GTK_TOOLBAR_H_
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