OBJ C dynamic library not work

[Matvii Jarosh]

today i test obj c dynamic library with file:

GNUmakefile:
GNUSTEP_MAKEFILES=/usr/share/GNUstep/Makefiles
SRCDIR = ./lib

include $(GNUSTEP_MAKEFILES)/common.make

LIBRARY_NAME = libgstep_guile

libgstep_guile_OBJC_FILES =  $(SRCDIR)/test.m
libgstep_guile_HEADER_FILES =

libgstep_guile_CPPFLAGS = $(shell pkg-config --cflags guile-3.0) -fPIC
libgstep_guile_OBJC_FLAGS = $(shell pkg-config --cflags guile-3.0) -fPIC
libgstep_guile_LINKFLAGS = $(shell gnustep-config --base-libs) 
-lgnustep-base
-include GNUmakefile.preamble

include $(GNUSTEP_MAKEFILES)/library.make

-include GNUmakefile.postamble

lib/test.m:
#include <stdio.h>
#include <Foundation/Foundation.h>
#include <libguile.h>

SCM
gsg_nslog_wrapper (SCM message)
{
    NSString *nsMessage = [NSString 
stringWithUTF8String:scm_to_utf8_string(message)];
    NSLog(@"%@", nsMessage);
    return SCM_UNSPECIFIED;
}
void
init_gsg ()
{
    scm_c_define_gsubr ("gsg-nslog", 1, 0, 0, gsg_nslog_wrapper);
}

test.scm:
(load-extension "./obj/libgstep_guile.so" "init_gsg")

(gsg-nslog "test")


but i got an error:
Backtrace:
In ice-9/boot-9.scm:
  1755:12  9 (with-exception-handler _ _ #:unwind? _ # _)
In unknown file:
           8 (apply-smob/0 #<thunk 7e0d6b70f300>)
In ice-9/boot-9.scm:
    724:2  7 (call-with-prompt _ _ #<procedure default-prompt-handle…>)
In ice-9/eval.scm:
    619:8  6 (_ #(#(#<directory (guile-user) 7e0d6b712c80>)))
In ice-9/boot-9.scm:
   2858:4  5 (save-module-excursion _)
  4408:12  4 (_)
In /home/matvii/Desktop/libgstep_guile/test.scm:
      1:0  3 (_)
In unknown file:
           2 (load-extension "./obj/libgstep_guile.so" "init_gsg")
In system/foreign-library.scm:
   190:25  1 (load-foreign-library _ #:extensions _ # _ #:search-path …)
In unknown file:
           0 (dlopen "./obj/libgstep_guile.so" 1)

In procedure dlopen:
In procedure dlopen: file "./obj/libgstep_guile.so", message 
"./obj/libgstep_guile.so: undefined symbol: 
__objc_class_name_NSConstantString"