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

Question

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

Answer 1

You can try to add more flags into GNUmakefile eg.
ADDITIONAL_INCLUDE_DIRS += c:\GNUstep\include\libxml2\ .. well I don't really know how to specify a path in a makefile on Windows..
may be you will have linking problem, play with
ADDITIONAL_LIB_DIRS += -L*your dll path..*
ADDITIONAL_OBJC_LIBS += -lxml2