Proof concept patch version 015.001.  Changes include, but are not limited to:

-  Fixed mc-test.  [When switching over from the move IT method to the dump glyph matrix method, cursor_type inadvertently got hard-coded as a BAR_CURSOR instead of respecting the user-defined cursor type/width for multiple fake cursors.]

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SETUP:

Step 1:  git clone -b master git://git.sv.gnu.org/emacs.git

Step 2:  In the new emacs folder, go back to an Emacs version from 07/07/2018:

git reset --hard 98463bed07ecc9057094928ffdc2321eaaf3ab52

[Going back in time to 07/07/2018 saves @lawlist a couple of hours by not having
to deal with unrelated recent changes to the master branch by the Emacs team.]

Step 3:  From within the new emacs folder created in Step 1, apply the patch:

git apply /path/to/the/11_11_2018__08_30_42_690.diff

[There should not be any error messages at this point; i.e, you should be returned to a new command prompt.]

Step 4:  ./autogen.sh

Step 5:  ./configure ... [your custom options]

Step 6:  make

Step 7:  make install

-  To try out built-in fake cursors with Magnar Sveen's library (multiple-cursors), install that package first.  [If the multiple-cursors package is installed, an eval-after-load "multiple-cursors-core" statement within crosshairs.el will redefine a couple of functions and set up a few keyboard shortcuts.]  If the multiple-cursors package by Magnar Sveen is not already installed, then there are two easy ways to install that package:

   Type:  M-x mc-install

   OR, evaluate the following snippet:

  (progn
    (require 'package)
    (add-to-list 'package-archives '("melpa" . "http://melpa.milkbox.net/packages/") t)
    (package-initialize)
    (package-refresh-contents)
    (package-install 'multiple-cursors))

-  To try out the crosshairs feature, open a relatively simple buffer (e.g., just code or text) and type:  M-x +-mode

    The default setting is on an idle timer, so just move around or type something to see how it works.

-  To see an example of a variety of built-in cursor styles and widths, type:  M-x mc-test