if we apply adjust how to check modules are installed or not, then
with perl 5.8.5
❯ perl -Ilib cpm.test install File::Spec
WARN You don't have Module::CoreList. The local-lib may result in incomplete self-contained directory.
DONE install Perl-OSType-1.010
DONE install Locale-Maketext-Simple-0.21
DONE install version-0.9924
FAIL install ExtUtils-CBuilder-0.280231
FAIL install ExtUtils-ParseXS-3.35
FAIL install IPC-Cmd-1.04
FAIL install Module-CoreList-5.20190720
FAIL install Module-Load-0.34
FAIL install Module-Load-Conditional-0.68
FAIL install Module-Metadata-1.000036
FAIL install Params-Check-0.38
FAIL install PathTools-3.75
FAIL install Test-Simple-1.302164
3 distributions installed.
See /Users/skaji/.perl-cpm/build.log for details.