1、yum install lcov
然后执行 lcov 命令

2、报错：Can't locate PerlIO/gzip.pm in @INC
(1) 安装 zlib 库：
wget http://www.zlib.net/zlib-1.2.11.tar.gz
tar zxvf zlib-1.2.11.tar.gz
cd zlib-1.2.11
./configure
make test
make install
（2）安装 gzip：
Download latest epel-release rpm fromhttp://download-ib01.fedoraproject.org/pub/epel/6/x86_64/

binary 名称：perl-PerlIO-gzip-0.18-6.el6.x86_64.rpm
Install epel-release rpm:# rpm -Uvh epel-release*rpm

3、报错：Can't locate JSON.pm in @INC
下载 http://www.cpan.org/authors/id/M/MA/MAKAMAKA/JSON-2.90.tar.gz
解压： tar -xzvf JSON-2.90.tar.gz
perl Makefile.PL
make 
make install