安装libmemcached报错，make后显示如下

make -j5  all-am

make[1]: 进入目录“/root/libmemcached-1.0.18”

  CXX      libhashkit/libhashkit_libhashkit_la-aes.lo

./libtool: line 1125: g++: command not found

make[1]: *** [libhashkit/libhashkit_libhashkit_la-aes.lo] 错误 1

make[1]: 离开目录“/root/libmemcached-1.0.18”

make: *** [all] 错误 2