错误详情：

$ ./pt-query-digest --version-check
Can't locate Digest/MD5.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at ./pt-query-digest line 2492.
BEGIN failed--compilation aborted at ./pt-query-digest line 2492.

解决：

yum -y install perl-Digest-MD5