foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
"$installdir/lib/ikiwiki") {
if (defined $dir && -x "$dir/plugins/$plugin") {
foreach my $dir (defined $config{libdir} ? possibly_foolish_untaint($config{libdir}) : undef,
"$installdir/lib/ikiwiki") {
if (defined $dir && -x "$dir/plugins/$plugin") {