# (and failing) to find the 'lib/auto/foo/bar.al' because it
# looked for 'lib/lib/auto/foo/bar.al', given @INC = ('lib').
- if (-r $filename) {
+ if (defined $filename and -r $filename) {
unless ($filename =~ m|^/|s) {
if ($is_dosish) {
unless ($filename =~ m{^([a-z]:)?[\\/]}is) {