Run lcov failed "Can't locate JSON/PP.pm in @INC ..."

When execute command: lcov --capture --directory . --no-external --output-file coverage.info to generate code coverage report, I encountered the following error:

$ lcov --capture --directory . --no-external --output-file coverage.info
Capturing coverage data from .
Can't locate JSON/PP.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 /usr/local/bin/geninfo line 63.
BEGIN failed--compilation aborted at /usr/local/bin/geninfo line 63.
sh-4.2$ perl -MCPAN -e 'install JSON'
Can't locate CPAN.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 .).
BEGIN failed--compilation aborted.

Can’t locate CPAN.pm

fixed this problem “Can’t locate CPAN.pm” by running the command yum install perl-CPAN

sh-4.2$ sudo perl -MCPAN -e 'install JSON'
[sudo] password for sxp:
Can't locate CPAN.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 .).
BEGIN failed--compilation aborted.
sh-4.2$ sudo yum install perl-CPAN

Then run sudo perl -MCPAN -e 'install JSON' again, it works.

Can’t locate JSON/PP.pm

fixed this problem by copying backportPP.pm to the PP.pm file.

$ cd /usr/local/share/perl5/JSON
$ ls
backportPP  backportPP.pm
$ cp backportPP.pm PP.pm