fail "cannot import $dscfn which seems to be inside working tree!";
}
$there =~ s#/+[^/]+$## or
- fail "cannot import $dscfn which seems to not have a basename";
+ fail "import $dscfn requires ../$f, but it does not exist";
$there .= "/$f";
symlink $there, $here or fail "symlink $there to $here: $!";
progress "made symlink $here -> $there";