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

Define the license if you are using in Build.PL. If you are using MakeMaker (Makefile.PL) you should upgrade to ExtUtils::MakeMaker version 6.31.

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: Encode::InCharset::8859_1, Encode::InCharset::8859_10, Encode::InCharset::8859_11, Encode::InCharset::8859_13, Encode::InCharset::8859_14, Encode::InCharset::8859_15, Encode::InCharset::8859_16, Encode::InCharset::8859_2, Encode::InCharset::8859_3, Encode::InCharset::8859_4, Encode::InCharset::8859_5, Encode::InCharset::8859_6, Encode::InCharset::8859_7, Encode::InCharset::8859_8, Encode::InCharset::8859_9, Encode::InCharset::adobeStdenc, Encode::InCharset::adobeSymbol, Encode::InCharset::adobeZdingbat, Encode::InCharset::ascii, Encode::InCharset::big5_eten, Encode::InCharset::big5_hkscs, Encode::InCharset::big5ext, Encode::InCharset::big5plus, Encode::InCharset::cccii, Encode::InCharset::cp037, Encode::InCharset::cp1006, Encode::InCharset::cp1026, Encode::InCharset::cp1047, Encode::InCharset::cp1250, Encode::InCharset::cp1251, Encode::InCharset::cp1252, Encode::InCharset::cp1253, Encode::InCharset::cp1254, Encode::InCharset::cp1255, Encode::InCharset::cp1256, Encode::InCharset::cp1257, Encode::InCharset::cp1258, Encode::InCharset::cp424, Encode::InCharset::cp437, Encode::InCharset::cp500, Encode::InCharset::cp737, Encode::InCharset::cp775, Encode::InCharset::cp850, Encode::InCharset::cp852, Encode::InCharset::cp855, Encode::InCharset::cp856, Encode::InCharset::cp857, Encode::InCharset::cp860, Encode::InCharset::cp861, Encode::InCharset::cp862, Encode::InCharset::cp863, Encode::InCharset::cp864, Encode::InCharset::cp865, Encode::InCharset::cp866, Encode::InCharset::cp869, Encode::InCharset::cp874, Encode::InCharset::cp875, Encode::InCharset::cp932, Encode::InCharset::cp936, Encode::InCharset::cp949, Encode::InCharset::cp950, Encode::InCharset::dingbats, Encode::InCharset::euc_cn, Encode::InCharset::euc_jp, Encode::InCharset::euc_jp2k, Encode::InCharset::euc_kr, Encode::InCharset::euc_tw, Encode::InCharset::gb12345, Encode::InCharset::gb18030, Encode::InCharset::gb2312, Encode::InCharset::gsm0338, Encode::InCharset::hp_roman8, Encode::InCharset::ir_165, Encode::InCharset::jis0201, Encode::InCharset::jis0208, Encode::InCharset::jis0212, Encode::InCharset::johab, Encode::InCharset::koi8_f, Encode::InCharset::koi8_r, Encode::InCharset::koi8_u, Encode::InCharset::ksc5601, Encode::InCharset::macArabic, Encode::InCharset::macCentEuro, Encode::InCharset::macChinsimp, Encode::InCharset::macChintrad, Encode::InCharset::macCroatian, Encode::InCharset::macCyrillic, Encode::InCharset::macDingbats, Encode::InCharset::macFarsi, Encode::InCharset::macGreek, Encode::InCharset::macHebrew, Encode::InCharset::macIceland, Encode::InCharset::macJapanese, Encode::InCharset::macKorean, Encode::InCharset::macROMnn, Encode::InCharset::macRUMnn, Encode::InCharset::macRoman, Encode::InCharset::macSami, Encode::InCharset::macSymbol, Encode::InCharset::macThai, Encode::InCharset::macTurkish, Encode::InCharset::macUkraine, Encode::InCharset::nextstep, Encode::InCharset::posix_bc, Encode::InCharset::shiftjis, Encode::InCharset::sjis_2k, Encode::InCharset::symbol, Encode::InCharset::viscii, Encode::InCharset::x0213_1, Encode::InCharset::x0213_2

This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.