build linux project error

I run the script make-all-linux-project.sh to build linux project,every thing is ok,but when build the HelloCpp project the
error occur,the out put is:

make[1]: 正在进入目录 `/home/tangnan/open_source/cocos2d-2.1rc0-x-2.1.2/samples/Cpp/HelloCpp/proj.linux’
CXX obj/debug/main.o
CXX obj/debug/Classes/AppDelegate.o
CXX obj/debug/Classes/HelloWorldScene.o
LINK bin/debug/HelloCpp
/usr/bin/ld: cannot find -lcocos2d
collect2: ld 返回 1
make[1]: * 错误 1
make[1]:正在离开目录 `/home/tangnan/open_source/cocos2d-2.1rc0-x-2.1.2/samples/Cpp/HelloCpp/proj.linux’
make:
* [all] 错误 2

how to solve this problem?