在ubuntu中找不到pthread_create

我正在尝试在Ubuntu上运行cocos2d-x。它显示此错误：

-- Looking for IceConnectionNumber in ICE
-- Looking for IceConnectionNumber in ICE - found
-- Found X11: /usr/lib/x86_64-linux-gnu/libX11.so
-- Found OpenGL: /usr/lib/x86_64-linux-gnu/libGL.so  
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Could NOT find Doxygen (missing:  DOXYGEN_EXECUTABLE) 

这是什么意思？

似乎最终找到了pthread_create，但缺少了Doxygen。运行sudo apt-get install doxygen，然后重试。