Comment 1 for bug 811892

It fails to build on amd64:

  LINK(target) out_linux/Release/gen_user_pos_data_main
out_linux/Release/obj.target/base/base/init.o: In function `Mutex':
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:98: undefined reference to `pthread_mutexattr_init'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:99: undefined reference to `pthread_mutexattr_settype'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:98: undefined reference to `pthread_mutexattr_init'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:99: undefined reference to `pthread_mutexattr_settype'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:98: undefined reference to `pthread_mutexattr_init'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:99: undefined reference to `pthread_mutexattr_settype'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:98: undefined reference to `pthread_mutexattr_init'
/tmp/buildd/mozc-1.1.758.102/./base/mutex.h:99: undefined reference to `pthread_mutexattr_settype'
collect2: ld returned 1 exit status
make[2]: *** [out_linux/Release/gen_user_pos_data_main] Error 1
make[2]: Leaving directory `/tmp/buildd/mozc-1.1.758.102'
Generating version definition file...
export $QTDIR = /usr/local/Trolltech/Qt-4.6.3
Running: make -j1 MAKE_JOBS=1 BUILDTYPE=Release primitive_tools
Traceback (most recent call last):
  File "build_mozc.py", line 959, in <module>
    main()
  File "build_mozc.py", line 947, in main
    BuildToolsMain(original_directory_name)
  File "build_mozc.py", line 911, in BuildToolsMain
    BuildMain(original_directory_name)
  File "build_mozc.py", line 888, in BuildMain
    BuildOnLinux(options, targets)
  File "build_mozc.py", line 759, in BuildOnLinux
    RunOrDie([make_command] + build_args + target_names)
  File "build_mozc.py", line 556, in RunOrDie
    '==========']))
__main__.RunOrDieError:
==========
 ERROR: make -j1 MAKE_JOBS=1 BUILDTYPE=Release primitive_tools
==========