require PublicInbox::Config;
my $pi_config = PublicInbox::Config->default_file;
-require File::Basename;
-my $dir = File::Basename::dirname($pi_config);
+my ($dir) = ($pi_config =~ m!(.*?/)[^/]+\z!);
require File::Path;
File::Path::mkpath($dir); # will croak on fatal errors