fedora19安装objected-c环境

 yum install gnustep*.x86_64

  GNUSTEP_MAKEFILES=/usr/lib64/GNUstep/Makefiles
  export GNUSTEP_MAKEFILES

#import <Foundation/Foundation.h>

int main(int argc, char * argv[]){
    NSLog(@"Hello world!\n");
    return 0;
}

 gcc `gnustep-config --objc-flags` -L/lib64/libobjc.so.4   -lgnustep-base  hello.m -o hello
/usr/bin/ld: /usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../lib64/libgnustep-base.so: undefined reference to symbol 'objc_msg_lookup'
/usr/bin/ld: note: 'objc_msg_lookup' is defined in DSO /lib64/libobjc.so.4 so try adding it to the linker command line
/lib64/libobjc.so.4: could not read symbols: 无效的操作
collect2: 错误：ld 返回 1

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$gcc hello.m `gnustep-config --objc-flags` -lobjc -lgnustep-base -o hello
$ ./hello
2013-11-18 22:16:42.869 hello[8531] Hello,world!

参考：

http://stackoverflow.com/questions/13446450/simple-hello-world-in-objective-c-with-clang-and-gnustep-does-not-compile