getting : error: 'autoreleasepool' undeclared (first use in this function)

[umen]

Hello all
im using gnusetup to learn objC , its great but . now i have basic error
which i can't find any hint how solve it 
i have this simple main :
#import <stdio.h> 
#import <Foundation/Foundation.h>
#import "ClassA.h"
#import "ClassB.h"

int main(int argsc,const char** argsv)
{
        @autoreleasepool {
                 
                ClassB* pClassB ;
                pClassB = [[ClassB alloc] init];
                
                
                
                [pClassB printX];
                [pClassB initVar:5];
                [pClassB printX];
        }
        return 0;
}

and the make file that looks like this :
include $(GNUSTEP_MAKEFILES)/common.make 
TOOL_NAME = IntTestInheritance
IntTestInheritance_HEADERS =  ClassA.h
IntTestInheritance_OBJC_FILES = main.m ClassA.m
IntTestInheritance_RESOURCE_FILES =

include $(GNUSTEP_MAKEFILES)/tool.make


and when compiling im getting this error:
$ make
This is gnustep-make 2.6.2. Type 'make print-gnustep-make-help' for help.
Making all for tool IntTestInheritance...
 Compiling file main.m ...
main.m: In function 'main':
main.m:8:2: error: stray '@' in program
main.m:8:3: error: 'autoreleasepool' undeclared (first use in this function)
main.m:8:3: note: each undeclared identifier is reported only once for each
function it appears in
main.m:8:19: error: expected ';' before '{' token
main.m:22:1: warning: control reaches end of non-void function
[-Wreturn-type]
make[3]: *** [obj/IntTestInheritance.obj/main.m.o] Error 1
make[2]: *** [internal-tool-all_] Error 2
make[1]: *** [IntTestInheritance.all.tool.variables] Error 2
make: *** [internal-all] Error 2

why ? 
thanks !



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