在編譯安裝protobuf 2.4時（具體安裝方法可以google），出現如下錯誤：
/bin/sh ../libtool --tag=CXX --mode=compile g++ -DHAVE_CONFIG_H -I. -I.. -D_THREAD_SAFE -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -O2 -g -DNDEBUG -MT message.lo -MD -MP -MF .deps/message.Tpo -c -o message.lo `test -f 'google/protobuf/message.cc' || echo './'`google/protobuf/message.cc
libtool: compile: g++ -DHAVE_CONFIG_H -I. -I.. -D_THREAD_SAFE -Wall -Wwrite-strings -Woverloaded-virtual -Wno-sign-compare -O2 -g -DNDEBUG -MT message.lo -MD -MP -MF .deps/message.Tpo -c google/protobuf/message.cc -fno-common -DPIC -o .libs/message.o
google/protobuf/message.cc:130:60: error: implicit instantiation of undefined template 'std::__1::basic_istream<char, std::__1::char_traits<char> >'
return ParseFromZeroCopyStream(&zero_copy_input) && input->eof();
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:108:28: note: template is declared here
class _LIBCPP_TYPE_VIS basic_istream;
^
google/protobuf/message.cc:135:67: error: implicit instantiation of undefined template 'std::__1::basic_istream<char, std::__1::char_traits<char> >'
return ParsePartialFromZeroCopyStream(&zero_copy_input) && input->eof();
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:108:28: note: template is declared here
class _LIBCPP_TYPE_VIS basic_istream;
^
google/protobuf/message.cc:175:16: error: implicit instantiation of undefined template 'std::__1::basic_ostream<char, std::__1::char_traits<char> >'
return output->good();
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/iosfwd:110:28: note: template is declared here
class _LIBCPP_TYPE_VIS basic_ostream;
^
3 errors generated.
make[2]: *** [message.lo] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2
錯誤提示的時，導錯了，經過搜索和檢查，發現需要修改
${PROTOBUF_HOME}/src/google/protobuf下的message.h文件，具體修改方式如下：
#ifdef __DECCXX
// HP C++'s iosfwd doesn't work.
#include <iostream>
#else
#include <sstream>
//#include <iosfwd>
#endif