参考：https://github.com/knmnyn/parscit，http://parscit.comp.nus.edu.sg/index.html

CentOS 6.8 (64 bits)

> wget https://www.cpan.org/src/5.0/perl-5.30.0.tar.gz
> tar -zxvf perl-5.30.0.tar.gz
> cd perl-5.30.0
> ./Configure -des -Dprefix=/usr/local/perl -Dusethreads -Uversiononly
> make
> make install
 
# 重定向
> mv /usr/bin/perl /usr/bin/perl.bak
> ln -s /usr/local/perl/bin/perl /usr/bin/perl
 
# 查看版本号
> perl --version

> yum install perl-CPAN
# 安装XML::Parser库下面这两个包
> yum install expat
> yum install expat-devel