/usr/include/GNUstep/AppKit/NSHelpPanel.h is in libgnustep-gui-dev 0.25.0-4+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | /* 
   NSHelpPanel.h
   Standard panel for showing help information
   Copyright (C) 1996 Free Software Foundation, Inc.
   Author:  Scott Christley <scottc@net-community.com>
   Date: 1996
   
   This file is part of the GNUstep GUI Library.
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
   Lesser General Public License for more details.
   You should have received a copy of the GNU Lesser General Public
   License along with this library; see the file COPYING.LIB.
   If not, see <http://www.gnu.org/licenses/> or write to the 
   Free Software Foundation, 51 Franklin Street, Fifth Floor, 
   Boston, MA 02110-1301, USA.
*/ 
#ifndef _GNUstep_H_NSHelpPanel
#define _GNUstep_H_NSHelpPanel
#import <GNUstepBase/GSVersionMacros.h>
#if OS_API_VERSION(GS_API_OPENSTEP,GS_API_MACOSX) || GS_API_VERSION(GS_API_NONE, GS_API_LATEST)
#import <AppKit/NSApplication.h>
#import <AppKit/NSPanel.h>
@class NSString;
@interface NSApplication (NSHelpPanel)
- (void) orderFrontHelpPanel: (id)sender;
@end
@interface NSHelpPanel : NSPanel
{
  // Attributes
}
//
// Accessing the Help Panel
//
+ (NSHelpPanel *) sharedHelpPanel;
+ (NSHelpPanel *) sharedHelpPanelWithDirectory: (NSString *)helpDirectory;
//
// Managing the Contents
//
+ (void) setHelpDirectory: (NSString *)helpDirectory;
- (void) addSupplement: (NSString *)helpDirectory
	        inPath: (NSString *)supplementPath;
- (NSString *) helpDirectory;
- (NSString *) helpFile;
//
// Attaching Help to Objects 
//
+ (void) attachHelpFile: (NSString *)filename
	     markerName: (NSString *)markerName
		     to: (id)anObject;
+ (void) detachHelpFrom: (id)anObject;
//
// Showing Help 
//
- (void) showFile: (NSString *)filename
	 atMarker: (NSString *)markerName;
- (BOOL) showHelpAttachedTo: (id)anObject;
//
// Printing 
//
- (void) print: (id)sender;
@end
#endif // !GS_API_MACOSX
#endif // _GNUstep_H_NSHelpPanel
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