Simple Hello World in Objective-C with clang and gnustep does not compile - objective-c

Question

System:
64bit Ubuntu Lucid
GNUStep
clang/LLVM
test.m
#import <Foundation/Foundation.h>
int main(int argc, char * argv[]){
NSLog(#"Hello world!\n");
return 0;
}
compile command line:
clang -fobjc-gc -I /usr/lib/gcc/x86_64-linux-gnu/4.4.3/include -I /usr/include/GNUstep/ -I /usr/lib/gcc/x86_64-linux-gnu/4.4.3/include-fixed/ -L /usr/lib/GNUstep/ -L /usr/lib64/ -fconstant-string-class=NSConstantString -rpath /usr/lib64 -Xlinker -lgnustep-base test.m -o Test
error:
/usr/bin/ld: /usr/lib64//libgnustep-base.so: undefined reference to symbol '__objc_exec_class'
/usr/bin/ld: note: '__objc_exec_class' is defined in DSO /usr/lib64/libobjc.so.2 so try adding it to the linker command line
/usr/lib64/libobjc.so.2: could not read symbols: Invalid operation
clang: error: linker command failed with exit code 1 (use -v to see invocation)
While using GCC, it compiles fine, but clang does not.

Answer 1

On a fresh install of Ubuntu 12.10 I installed the following packages:
$ sudo apt-get install build-essential
$ sudo apt-get install clang
$ sudo apt-get install gnustep
$ sudo apt-get install gnustep-make
$ sudo apt-get install gnustep-devel
$ sudo ln -s /usr/lib/gcc/i686-linux-gnu/4.7/include/objc /usr/local/include/objc
(the final symlink is required to properly locate the objc.h header)
Then I compiled the test.m file as follows:
$ clang -o test test.m -I `gnustep-config --variable=GNUSTEP_SYSTEM_HEADERS` \
-L `gnustep-config --variable=GNUSTEP_SYSTEM_LIBRARIES` \
-lgnustep-base -fconstant-string-class=NSConstantString \
-D_NATIVE_OBJC_EXCEPTIONS \
-lobjc
tux#ubuntu:~/Desktop$ ./test
2012-11-20 11:02:08.184 test[11856] Hello world!
* EDIT
On a fresh 10.04-64bit this allows to compile just fine:
$ sudo apt-get install build-essential
$ sudo apt-get install clang
$ sudo apt-get install gnustep-devel
$ sudo ln -s /usr/lib/gcc/x86_64-linux-gnu/4.4.3/include/objc/ /usr/local/include/objc