How to link a objective-c library into a c/c++ project

Question

I have this code:

for the objective-c library

GNUmakefile

include $(GNUSTEP_MAKEFILES)/common.make

LIBRARY_NAME = libteste
libteste_OBJC_FILES = ./src/teste.m

libteste_HEADER_FILES_DIR = ./include
libteste_HEADER_FILES_INSTALL_DIR = include
libteste_HEADER_FILES = teste.h

-include GNUmakefile.preamble
include $(GNUSTEP_MAKEFILES)/library.make
-include GNUmakefile.postamble

teste.h

#import <Foundation/Foundation.h>

@interface SampleClass:NSObject
- (void)sampleMethod;
@end

teste.m

#include "teste.h"

@implementation SampleClass

- (void)sampleMethod {
   NSLog(@"Hello, World! \n");
}

@end

for the c source code

Makefile

all: teste

teste: teste.o
    g++ -L ../libteste2/obj -o teste -Wl,-rpath='./' teste.o -lone -lteste2

teste.o: teste.c
    g++ -I ../libteste2/include -c teste.c -o teste.o

teste.c

#include "teste.h"

int main() {
    SampleClass sample;
    sample.sampleMethod();
    return 0;
}

the objective-c library compiles without errors, but when I try compile the c source code, I got several (because the compiles do not recognize the objective-c code).

Is there any way to link this objective-c library to the c source code?