下载的R软件3.2.3版本，下载CAR程序序，加载的时候总是出问题
  These will not be installed
> library("car")
Error in loadNamespace(i, c(lib.loc, .libPaths()), versionCheck = vI[[i]]) :
  不存在叫‘lme4’这个名字的程辑包
错误: ‘car’程辑包或名字空间载入失败，

下载lme4程序包，又不行
> install.packages("lme4")
Package which is only available in source form, and may need
  compilation of C/C++/Fortran: ‘lme4’
  These will not be installed

怎么解决啊，本人菜鸟一个，求大神