Brpc cannot link on Ubuntu LTS 16.04

[beenchaos]

Linking echo_client
../..//output/lib/libbrpc.a(channel.o): In function std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > butil::class_name_str<brpc::Describable>(brpc::Describable const&)': /home/brpc/brpc/./src/butil/class_name.h:52: undefined reference to butil::demangle(char const*)'
../..//output/lib/libbrpc.a(load_balancer.o): In function std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > butil::class_name_str<brpc::NonConstDescribable>(brpc::NonConstDescribable const&)': /home/brpc/brpc/./src/butil/class_name.h:52: undefined reference to butil::demangle(char const*)'
/home/brpc/brpc/./src/butil/class_name.h:52: undefined reference to butil::demangle(char const*)' ../..//output/lib/libbrpc.a(socket.o): In function std::__cxx11::basic_string<char, std::char_traits, std::allocator > butil::class_name_strbrpc::Describable(brpc::Describable const&)':
/home/brpc/brpc/./src/butil/class_name.h:52: undefined reference to butil::demangle(char const*)' ../..//output/lib/libbrpc.a(socket.o): In function std::__cxx11::basic_string<char, std::char_traits, std::allocator > butil::class_name_strbrpc::SocketUser(brpc::SocketUser const&)':
/home/brpc/brpc/./src/butil/class_name.h:52: undefined reference to butil::demangle(char const*)' ../..//output/lib/libbrpc.a(socket.o):/home/brpc/brpc/./src/butil/class_name.h:52: more undefined references to butil::demangle(char const*)' follow
collect2: error: ld returned 1 exit status
Makefile:34: recipe for target 'echo_client' failed
make: *** [echo_client] Error 1

[chenzhangyi]

Looks like it's duplicated with #6. Please try update brpc.