How can I install libtoolize in cygwin?

You will need GNU M4 1.4.6 or later to install LibTool (which includes libtoolize).

Good news is that you can easily do it if you run the Cygwin installer (no worries, it will keep your Cygwin installation and add new packages if you select them). So all you need to do is to click on the following buttons:

GNU M4 installation

LibTool installation

'libtoolize' is a part of libtool. You can dowload latest version of libtool from http://ftp.gnu.org/gnu/libtool/, extract it, then run ./configure and make install from cygwin terminal.