GNUSetup objective-c , can't find libxml/tree.h file not found

[umen]

i trying to use libxml2 in GNUsetup in windows using objective-C 
compiling with clang. 
it keeps giving me the error:

    $ make CC=clang 
    This is gnustep-make 2.6.2. Type 'make print-gnustep-make-help' for
help.
    Making all for tool sample_app...
     Compiling file HtmlParser.m ...
    In file included from HtmlParser.m:1:
    ./HtmlParser.h:2:9: fatal error: 'libxml/tree.h' file not found
    #import <libxml/tree.h>
            ^
    1 error generated.
    make[3]: *** [obj/sample_app.obj/HtmlParser.m.o] Error 1
    make[2]: *** [internal-tool-all_] Error 2
    make[1]: *** [sample_app.all.tool.variables] Error 2
    make: *** [internal-all] Error 2


the files do existe in :c:\GNUstep\include\libxml2\libxml\


this is my GNUsetup file which compiles the files 
 
    include $(GNUSTEP_MAKEFILES)/common.make
    
    
    
    TOOL_NAME = sample_app
    
    sample_app_HEADERS = HttpManager.h UT.h HtmlParser.h
    sample_app_OBJC_FILES = main.m HttpManager.m UT.m HtmlParser.m
    sample_app_RESOURCE_FILES =
    
    include $(GNUSTEP_MAKEFILES)/tool.make

and this is my file that include the libxml2 headers 

    #import <Foundation/Foundation.h>
    #import <libxml/tree.h>
    #import <libxml/parser.h>
    #import <libxml/HTMLparser.h>
    #import <libxml/xpath.h>
    #import <libxml/xpathInternals.h>
    
    @interface HtmlParser
    {
        NSString* encoding;
    }
     
    
    -(id)init
    {
        self = [super init];
        if(self) {
                encoding = @"UTF-8";
        }
        
        return self;
        
    }
    
     
    -(void)ExtractInnerSiteLinks:(NSString*) PageHtml:(NSString*) url;
    
    
    @end




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