diff /usr/lib/x86_64-linux-gnu/perl/5.26.1/Config.pm /usr/lib/x86_64-linux-gnu/perl-base/Config.pm >2.txt
diff /usr/lib/x86_64-linux-gnu/perl/5.26.1/Config.pm /usr/lib/x86_64-linux-gnu/perl/cross-config-5.26.1/Config.pm  >3.txt
diff /usr/lib/x86_64-linux-gnu/perl-base/Config.pm /usr/lib/x86_64-linux-gnu/perl/cross-config-5.26.1/Config.pm  >5.txt