We rename libtoolize -> glibtoolize on macOS to avoid conflicting with
the system tool.
--- a/bin/autoreconf.in
+++ b/bin/autoreconf.in
@@ -130,7 +130,7 @@ my %C = (
   autom4te    => $ENV{'AUTOM4TE'}    || '@bindir@/@autom4te-name@',
   automake    => $ENV{'AUTOMAKE'}    || 'automake',
   aclocal     => $ENV{'ACLOCAL'}     || 'aclocal',
-  libtoolize  => $ENV{'LIBTOOLIZE'}  || 'libtoolize',
+  libtoolize  => $ENV{'LIBTOOLIZE'}  || 'glibtoolize',
   intltoolize => $ENV{'INTLTOOLIZE'} || 'intltoolize',
   gtkdocize   => $ENV{'GTKDOCIZE'}   || 'gtkdocize',
   autopoint   => $ENV{'AUTOPOINT'}   || 'autopoint',