installed libtool but libtoolize not found

To bring together a few threads libtoolize is installed as glibtoolize when you install libtool using brew. This can be achieved as follows; install it and then create a softlink for libtoolize:

brew install libtool
ln -s /usr/local/bin/glibtoolize /usr/local/bin/libtoolize

I hope my answer is not too naive. I am a noob to OSX.

brew install libtool solved a similar issue for me.

You typically need to use glibtool and glibtoolize, since libtool already exists on OS X as a binary tool for creating Mach-O dynamic libraries. So, that's how MacPorts installs it, using a program name transform, though the port itself is still named 'libtool'.

Some autogen.sh scripts (or their equivalent) will honor the LIBTOOL / LIBTOOLIZE environment variables. I have a line in my own autogen.sh scripts:

case `uname` in Darwin*) glibtoolize --copy ;;
  *) libtoolize --copy ;; esac

You may or may not want the --copy flag.

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Note: If you've installed the autotools using MacPorts, a correctly written configure.ac with Makefile.am files should only require autoreconf -fvi. It should call glibtoolize, etc., as expected. Otherwise, some packages will distribute an autogen.sh or similar script.