Just for the record, I found the flaw in this scheme. One of my included modules includes 'Storable', which tries to include 'Log::Agent'. If it fails then the 'Storable' module does something else. The above @INC scheme forces the user to install the conditional module. This shouldn't happen.
So back to the old method (slightly refined to handle module versions and import lists)
{
our @missing =
map +(m/^(\S+)/),
grep !eval "use $_; 1",
grep $_,
split /\s*\n\s*/, "
Storable
File::Basename
A::B wq(a b c)
Foo::Bar
CGI qw/:standard/
" and die "Please install CPAN modules: cpan -i @missing\n";
}
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