If you are using Build.PL define the {requires}{perl} = VERSION field. If you are using MakeMaker (Makefile.PL) you should upgrade ExtUtils::MakeMaker to 6.48 and use MIN_PERL_VERSION parameter. Perl::MinimumVersion can help you determine which version of Perl your module needs.

Add a META.json to the distribution. Your buildtool should be able to autogenerate it.

Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: DateTime::TimeZone::Africa::Abidjan, DateTime::TimeZone::Africa::Accra, DateTime::TimeZone::Africa::Addis_Ababa, DateTime::TimeZone::Africa::Algiers, DateTime::TimeZone::Africa::Asmara, DateTime::TimeZone::Africa::Bamako, DateTime::TimeZone::Africa::Bangui, DateTime::TimeZone::Africa::Banjul, DateTime::TimeZone::Africa::Bissau, DateTime::TimeZone::Africa::Blantyre, DateTime::TimeZone::Africa::Brazzaville, DateTime::TimeZone::Africa::Bujumbura, DateTime::TimeZone::Africa::Cairo, DateTime::TimeZone::Africa::Casablanca, DateTime::TimeZone::Africa::Ceuta, DateTime::TimeZone::Africa::Conakry, DateTime::TimeZone::Africa::Dakar, DateTime::TimeZone::Africa::Dar_es_Salaam, DateTime::TimeZone::Africa::Djibouti, DateTime::TimeZone::Africa::Douala, DateTime::TimeZone::Africa::El_Aaiun, DateTime::TimeZone::Africa::Freetown, DateTime::TimeZone::Africa::Gaborone, DateTime::TimeZone::Africa::Harare, DateTime::TimeZone::Africa::Johannesburg, DateTime::TimeZone::Africa::Kampala, DateTime::TimeZone::Africa::Khartoum, DateTime::TimeZone::Africa::Kigali, DateTime::TimeZone::Africa::Kinshasa, DateTime::TimeZone::Africa::Lagos, DateTime::TimeZone::Africa::Libreville, DateTime::TimeZone::Africa::Lome, DateTime::TimeZone::Africa::Luanda, DateTime::TimeZone::Africa::Lubumbashi, DateTime::TimeZone::Africa::Lusaka, DateTime::TimeZone::Africa::Malabo, DateTime::TimeZone::Africa::Maputo, DateTime::TimeZone::Africa::Maseru, DateTime::TimeZone::Africa::Mbabane, DateTime::TimeZone::Africa::Mogadishu, DateTime::TimeZone::Africa::Monrovia, DateTime::TimeZone::Africa::Nairobi, DateTime::TimeZone::Africa::Ndjamena, DateTime::TimeZone::Africa::Niamey, DateTime::TimeZone::Africa::Nouakchott, DateTime::TimeZone::Africa::Ouagadougou, DateTime::TimeZone::Africa::Porto_Novo, DateTime::TimeZone::Africa::Sao_Tome, DateTime::TimeZone::Africa::Tripoli, DateTime::TimeZone::Africa::Tunis, DateTime::TimeZone::Africa::Windhoek, DateTime::TimeZone::America::Adak, DateTime::TimeZone::America::Anchorage, DateTime::TimeZone::America::Anguilla, DateTime::TimeZone::America::Antigua, DateTime::TimeZone::America::Araguaina, DateTime::TimeZone::America::Argentina::Buenos_Aires, DateTime::TimeZone::America::Argentina::Catamarca, DateTime::TimeZone::America::Argentina::Cordoba, DateTime::TimeZone::America::Argentina::Jujuy, DateTime::TimeZone::America::Argentina::La_Rioja, DateTime::TimeZone::America::Argentina::Mendoza, DateTime::TimeZone::America::Argentina::Rio_Gallegos, DateTime::TimeZone::America::Argentina::Salta, DateTime::TimeZone::America::Argentina::San_Juan, DateTime::TimeZone::America::Argentina::San_Luis, DateTime::TimeZone::America::Argentina::Tucuman, DateTime::TimeZone::America::Argentina::Ushuaia, DateTime::TimeZone::America::Aruba, DateTime::TimeZone::America::Asuncion, DateTime::TimeZone::America::Atikokan, DateTime::TimeZone::America::Bahia, DateTime::TimeZone::America::Barbados, DateTime::TimeZone::America::Belem, DateTime::TimeZone::America::Belize, DateTime::TimeZone::America::Blanc_Sablon, DateTime::TimeZone::America::Boa_Vista, DateTime::TimeZone::America::Bogota, DateTime::TimeZone::America::Boise, DateTime::TimeZone::America::Cambridge_Bay, DateTime::TimeZone::America::Campo_Grande, DateTime::TimeZone::America::Cancun, DateTime::TimeZone::America::Caracas, DateTime::TimeZone::America::Cayenne, DateTime::TimeZone::America::Cayman, DateTime::TimeZone::America::Chicago, DateTime::TimeZone::America::Chihuahua, DateTime::TimeZone::America::Costa_Rica, DateTime::TimeZone::America::Cuiaba, DateTime::TimeZone::America::Curacao, DateTime::TimeZone::America::Danmarkshavn, DateTime::TimeZone::America::Dawson, DateTime::TimeZone::America::Dawson_Creek, DateTime::TimeZone::America::Denver, DateTime::TimeZone::America::Detroit, DateTime::TimeZone::America::Dominica, DateTime::TimeZone::America::Edmonton, DateTime::TimeZone::America::Eirunepe, DateTime::TimeZone::America::El_Salvador, DateTime::TimeZone::America::Fortaleza, DateTime::TimeZone::America::Glace_Bay, DateTime::TimeZone::America::Godthab, DateTime::TimeZone::America::Goose_Bay, DateTime::TimeZone::America::Grand_Turk, DateTime::TimeZone::America::Grenada, DateTime::TimeZone::America::Guadeloupe, DateTime::TimeZone::America::Guatemala, DateTime::TimeZone::America::Guayaquil, DateTime::TimeZone::America::Guyana, DateTime::TimeZone::America::Halifax, DateTime::TimeZone::America::Havana, DateTime::TimeZone::America::Hermosillo, DateTime::TimeZone::America::Indiana::Indianapolis, DateTime::TimeZone::America::Indiana::Knox, DateTime::TimeZone::America::Indiana::Marengo, DateTime::TimeZone::America::Indiana::Petersburg, DateTime::TimeZone::America::Indiana::Tell_City, DateTime::TimeZone::America::Indiana::Vevay, DateTime::TimeZone::America::Indiana::Vincennes, DateTime::TimeZone::America::Indiana::Winamac, DateTime::TimeZone::America::Inuvik, DateTime::TimeZone::America::Iqaluit, DateTime::TimeZone::America::Jamaica, DateTime::TimeZone::America::Juneau, DateTime::TimeZone::America::Kentucky::Louisville, DateTime::TimeZone::America::Kentucky::Monticello, DateTime::TimeZone::America::La_Paz, DateTime::TimeZone::America::Lima, DateTime::TimeZone::America::Los_Angeles, DateTime::TimeZone::America::Maceio, DateTime::TimeZone::America::Managua, DateTime::TimeZone::America::Manaus, DateTime::TimeZone::America::Martinique, DateTime::TimeZone::America::Mazatlan, DateTime::TimeZone::America::Menominee, DateTime::TimeZone::America::Merida, DateTime::TimeZone::America::Mexico_City, DateTime::TimeZone::America::Miquelon, DateTime::TimeZone::America::Moncton, DateTime::TimeZone::America::Monterrey, DateTime::TimeZone::America::Montevideo, DateTime::TimeZone::America::Montreal, DateTime::TimeZone::America::Montserrat, DateTime::TimeZone::America::Nassau, DateTime::TimeZone::America::New_York, DateTime::TimeZone::America::Nipigon, DateTime::TimeZone::America::Nome, DateTime::TimeZone::America::Noronha, DateTime::TimeZone::America::North_Dakota::Center, DateTime::TimeZone::America::North_Dakota::New_Salem, DateTime::TimeZone::America::Panama, DateTime::TimeZone::America::Pangnirtung, DateTime::TimeZone::America::Paramaribo, DateTime::TimeZone::America::Phoenix, DateTime::TimeZone::America::Port_au_Prince, DateTime::TimeZone::America::Port_of_Spain, DateTime::TimeZone::America::Porto_Velho, DateTime::TimeZone::America::Puerto_Rico, DateTime::TimeZone::America::Rainy_River, DateTime::TimeZone::America::Rankin_Inlet, DateTime::TimeZone::America::Recife, DateTime::TimeZone::America::Regina, DateTime::TimeZone::America::Resolute, DateTime::TimeZone::America::Rio_Branco, DateTime::TimeZone::America::Santarem, DateTime::TimeZone::America::Santiago, DateTime::TimeZone::America::Santo_Domingo, DateTime::TimeZone::America::Sao_Paulo, DateTime::TimeZone::America::Scoresbysund, DateTime::TimeZone::America::St_Johns, DateTime::TimeZone::America::St_Kitts, DateTime::TimeZone::America::St_Lucia, DateTime::TimeZone::America::St_Thomas, DateTime::TimeZone::America::St_Vincent, DateTime::TimeZone::America::Swift_Current, DateTime::TimeZone::America::Tegucigalpa, DateTime::TimeZone::America::Thule, DateTime::TimeZone::America::Thunder_Bay, DateTime::TimeZone::America::Tijuana, DateTime::TimeZone::America::Toronto, DateTime::TimeZone::America::Tortola, DateTime::TimeZone::America::Vancouver, DateTime::TimeZone::America::Whitehorse, DateTime::TimeZone::America::Winnipeg, DateTime::TimeZone::America::Yakutat, DateTime::TimeZone::America::Yellowknife, DateTime::TimeZone::Antarctica::Casey, DateTime::TimeZone::Antarctica::Davis, DateTime::TimeZone::Antarctica::DumontDUrville, DateTime::TimeZone::Antarctica::Mawson, DateTime::TimeZone::Antarctica::McMurdo, DateTime::TimeZone::Antarctica::Palmer, DateTime::TimeZone::Antarctica::Rothera, DateTime::TimeZone::Antarctica::Syowa, DateTime::TimeZone::Antarctica::Vostok, DateTime::TimeZone::Asia::Aden, DateTime::TimeZone::Asia::Almaty, DateTime::TimeZone::Asia::Amman, DateTime::TimeZone::Asia::Anadyr, DateTime::TimeZone::Asia::Aqtau, DateTime::TimeZone::Asia::Aqtobe, DateTime::TimeZone::Asia::Ashgabat, DateTime::TimeZone::Asia::Baghdad, DateTime::TimeZone::Asia::Bahrain, DateTime::TimeZone::Asia::Baku, DateTime::TimeZone::Asia::Bangkok, DateTime::TimeZone::Asia::Beirut, DateTime::TimeZone::Asia::Bishkek, DateTime::TimeZone::Asia::Brunei, DateTime::TimeZone::Asia::Choibalsan, DateTime::TimeZone::Asia::Chongqing, DateTime::TimeZone::Asia::Colombo, DateTime::TimeZone::Asia::Damascus, DateTime::TimeZone::Asia::Dhaka, DateTime::TimeZone::Asia::Dili, DateTime::TimeZone::Asia::Dubai, DateTime::TimeZone::Asia::Dushanbe, DateTime::TimeZone::Asia::Gaza, DateTime::TimeZone::Asia::Harbin, DateTime::TimeZone::Asia::Ho_Chi_Minh, DateTime::TimeZone::Asia::Hong_Kong, DateTime::TimeZone::Asia::Hovd, DateTime::TimeZone::Asia::Irkutsk, DateTime::TimeZone::Asia::Jakarta, DateTime::TimeZone::Asia::Jayapura, DateTime::TimeZone::Asia::Jerusalem, DateTime::TimeZone::Asia::Kabul, DateTime::TimeZone::Asia::Kamchatka, DateTime::TimeZone::Asia::Karachi, DateTime::TimeZone::Asia::Kashgar, DateTime::TimeZone::Asia::Kathmandu, DateTime::TimeZone::Asia::Kolkata, DateTime::TimeZone::Asia::Krasnoyarsk, DateTime::TimeZone::Asia::Kuala_Lumpur, DateTime::TimeZone::Asia::Kuching, DateTime::TimeZone::Asia::Kuwait, DateTime::TimeZone::Asia::Macau, DateTime::TimeZone::Asia::Magadan, DateTime::TimeZone::Asia::Makassar, DateTime::TimeZone::Asia::Manila, DateTime::TimeZone::Asia::Muscat, DateTime::TimeZone::Asia::Nicosia, DateTime::TimeZone::Asia::Novosibirsk, DateTime::TimeZone::Asia::Omsk, DateTime::TimeZone::Asia::Oral, DateTime::TimeZone::Asia::Phnom_Penh, DateTime::TimeZone::Asia::Pontianak, DateTime::TimeZone::Asia::Pyongyang, DateTime::TimeZone::Asia::Qatar, DateTime::TimeZone::Asia::Qyzylorda, DateTime::TimeZone::Asia::Rangoon, DateTime::TimeZone::Asia::Riyadh, DateTime::TimeZone::Asia::Sakhalin, DateTime::TimeZone::Asia::Samarkand, DateTime::TimeZone::Asia::Seoul, DateTime::TimeZone::Asia::Shanghai, DateTime::TimeZone::Asia::Singapore, DateTime::TimeZone::Asia::Taipei, DateTime::TimeZone::Asia::Tashkent, DateTime::TimeZone::Asia::Tbilisi, DateTime::TimeZone::Asia::Tehran, DateTime::TimeZone::Asia::Thimphu, DateTime::TimeZone::Asia::Tokyo, DateTime::TimeZone::Asia::Ulaanbaatar, DateTime::TimeZone::Asia::Urumqi, DateTime::TimeZone::Asia::Vientiane, DateTime::TimeZone::Asia::Vladivostok, DateTime::TimeZone::Asia::Yakutsk, DateTime::TimeZone::Asia::Yekaterinburg, DateTime::TimeZone::Asia::Yerevan, DateTime::TimeZone::Atlantic::Azores, DateTime::TimeZone::Atlantic::Bermuda, DateTime::TimeZone::Atlantic::Canary, DateTime::TimeZone::Atlantic::Cape_Verde, DateTime::TimeZone::Atlantic::Faroe, DateTime::TimeZone::Atlantic::Madeira, DateTime::TimeZone::Atlantic::Reykjavik, DateTime::TimeZone::Atlantic::South_Georgia, DateTime::TimeZone::Atlantic::St_Helena, DateTime::TimeZone::Atlantic::Stanley, DateTime::TimeZone::Australia::Adelaide, DateTime::TimeZone::Australia::Brisbane, DateTime::TimeZone::Australia::Broken_Hill, DateTime::TimeZone::Australia::Currie, DateTime::TimeZone::Australia::Darwin, DateTime::TimeZone::Australia::Eucla, DateTime::TimeZone::Australia::Hobart, DateTime::TimeZone::Australia::Lindeman, DateTime::TimeZone::Australia::Lord_Howe, DateTime::TimeZone::Australia::Melbourne, DateTime::TimeZone::Australia::Perth, DateTime::TimeZone::Australia::Sydney, DateTime::TimeZone::CET, DateTime::TimeZone::CST6CDT, DateTime::TimeZone::Catalog, DateTime::TimeZone::EET, DateTime::TimeZone::EST, DateTime::TimeZone::EST5EDT, DateTime::TimeZone::Europe::Amsterdam, DateTime::TimeZone::Europe::Andorra, DateTime::TimeZone::Europe::Athens, DateTime::TimeZone::Europe::Belgrade, DateTime::TimeZone::Europe::Berlin, DateTime::TimeZone::Europe::Brussels, DateTime::TimeZone::Europe::Bucharest, DateTime::TimeZone::Europe::Budapest, DateTime::TimeZone::Europe::Chisinau, DateTime::TimeZone::Europe::Copenhagen, DateTime::TimeZone::Europe::Dublin, DateTime::TimeZone::Europe::Gibraltar, DateTime::TimeZone::Europe::Helsinki, DateTime::TimeZone::Europe::Istanbul, DateTime::TimeZone::Europe::Kaliningrad, DateTime::TimeZone::Europe::Kiev, DateTime::TimeZone::Europe::Lisbon, DateTime::TimeZone::Europe::London, DateTime::TimeZone::Europe::Luxembourg, DateTime::TimeZone::Europe::Madrid, DateTime::TimeZone::Europe::Malta, DateTime::TimeZone::Europe::Minsk, DateTime::TimeZone::Europe::Monaco, DateTime::TimeZone::Europe::Moscow, DateTime::TimeZone::Europe::Oslo, DateTime::TimeZone::Europe::Paris, DateTime::TimeZone::Europe::Prague, DateTime::TimeZone::Europe::Riga, DateTime::TimeZone::Europe::Rome, DateTime::TimeZone::Europe::Samara, DateTime::TimeZone::Europe::Simferopol, DateTime::TimeZone::Europe::Sofia, DateTime::TimeZone::Europe::Stockholm, DateTime::TimeZone::Europe::Tallinn, DateTime::TimeZone::Europe::Tirane, DateTime::TimeZone::Europe::Uzhgorod, DateTime::TimeZone::Europe::Vaduz, DateTime::TimeZone::Europe::Vienna, DateTime::TimeZone::Europe::Vilnius, DateTime::TimeZone::Europe::Volgograd, DateTime::TimeZone::Europe::Warsaw, DateTime::TimeZone::Europe::Zaporozhye, DateTime::TimeZone::Europe::Zurich, DateTime::TimeZone::Floating, DateTime::TimeZone::HST, DateTime::TimeZone::Indian::Antananarivo, DateTime::TimeZone::Indian::Chagos, DateTime::TimeZone::Indian::Christmas, DateTime::TimeZone::Indian::Cocos, DateTime::TimeZone::Indian::Comoro, DateTime::TimeZone::Indian::Kerguelen, DateTime::TimeZone::Indian::Mahe, DateTime::TimeZone::Indian::Maldives, DateTime::TimeZone::Indian::Mauritius, DateTime::TimeZone::Indian::Mayotte, DateTime::TimeZone::Indian::Reunion, DateTime::TimeZone::MET, DateTime::TimeZone::MST, DateTime::TimeZone::MST7MDT, DateTime::TimeZone::OffsetOnly, DateTime::TimeZone::OlsonDB, DateTime::TimeZone::PST8PDT, DateTime::TimeZone::Pacific::Apia, DateTime::TimeZone::Pacific::Auckland, DateTime::TimeZone::Pacific::Chatham, DateTime::TimeZone::Pacific::Easter, DateTime::TimeZone::Pacific::Efate, DateTime::TimeZone::Pacific::Enderbury, DateTime::TimeZone::Pacific::Fakaofo, DateTime::TimeZone::Pacific::Fiji, DateTime::TimeZone::Pacific::Funafuti, DateTime::TimeZone::Pacific::Galapagos, DateTime::TimeZone::Pacific::Gambier, DateTime::TimeZone::Pacific::Guadalcanal, DateTime::TimeZone::Pacific::Guam, DateTime::TimeZone::Pacific::Honolulu, DateTime::TimeZone::Pacific::Johnston, DateTime::TimeZone::Pacific::Kiritimati, DateTime::TimeZone::Pacific::Kosrae, DateTime::TimeZone::Pacific::Kwajalein, DateTime::TimeZone::Pacific::Majuro, DateTime::TimeZone::Pacific::Marquesas, DateTime::TimeZone::Pacific::Midway, DateTime::TimeZone::Pacific::Nauru, DateTime::TimeZone::Pacific::Niue, DateTime::TimeZone::Pacific::Norfolk, DateTime::TimeZone::Pacific::Noumea, DateTime::TimeZone::Pacific::Pago_Pago, DateTime::TimeZone::Pacific::Palau, DateTime::TimeZone::Pacific::Pitcairn, DateTime::TimeZone::Pacific::Ponape, DateTime::TimeZone::Pacific::Port_Moresby, DateTime::TimeZone::Pacific::Rarotonga, DateTime::TimeZone::Pacific::Saipan, DateTime::TimeZone::Pacific::Tahiti, DateTime::TimeZone::Pacific::Tarawa, DateTime::TimeZone::Pacific::Tongatapu, DateTime::TimeZone::Pacific::Truk, DateTime::TimeZone::Pacific::Wake, DateTime::TimeZone::Pacific::Wallis, DateTime::TimeZone::UTC, DateTime::TimeZone::WET

Split the distribution, or fix the version numbers to make them consistent (use the highest version number to avoid version downgrade).

Error: 0.01,0.02,0.89

Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).