Compiling Aspell on Windows

DOWNLOAD ASPELL

Download and extract GNU Aspell 0.60.6.1 from http://aspell.net/
Download and extract the English dictionary (aspell6-en-2016.01.19-0.tar.bz2)

INSTALL CHOCOLATEY MACHINE PACKAGE MANAGER

Start PowerShell as Administrator
Enter the following commands: 
Set-ExecutionPolicy ByPass
iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))

INSTALL THE BUILD TOOLS

Start cmd as Administrator
Enter the following commands: 
choco install msys2
choco install mingw
choco install activeperl
choco install linkshellextension 

Start msys2_shell.bat in C:\tools\msys2
Enter the following commands: 

pacman -S make
pacman -S diffutils

UPDATE BUILD SCRIPT

Overwrite config.guess with file from http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.guess;hb=HEAD
Overwrite config.sub with file from http://git.savannah.gnu.org/gitweb/?p=config.git;a=blob_plain;f=config.sub;hb=HEAD

BUILD

In msys2 shell, navigate to downloaded Aspell
Enter: 
./configure CXXFLAGS='-O2' --enable-win32-relocatable --disable-rpath --prefix="C:/tools/Aspell" --enable-data-dir="C:/tools/Aspell/data" --enable-dict-dir="C:/tools/Aspell/data"

In the downloaded Aspell, add the file gen/dirs.h with the following contents
#define PREFIX "C:/tools/Aspell"
#define DATA_DIR "C:/tools/Aspell/data"
#define DICT_DIR DATA_DIR
#define CONF_DIR PREFIX

Add a line to common/file_util.cpp under the “#ifdef WIN32” section
#include "asc_ctype.hpp"

In msys2 shell, enter
make
make install
Add C:\tools\Aspell\bin to PATH system environment variable

Create hardlink from C:\tools\Aspell\data (drop as hardlink) to C:\tools\Aspell\lib\aspell-0.60 (pick link source)

Restart msys2 shell and navigate to downloaded Aspell dictionary and enter
./configure
make
make install

FINAL STEPS

Open cmd, navigate to c:\tools\Aspell\bin and enter

aspell dump config > ../aspell.conf

Open c:\tools\Aspell\aspell.conf in Notepad and add
encoding utf-8
below # default: !encoding = none

Add
sug-mode bad-spellers
below
# sug-mode (string)
#   suggestion mode
# default: normal

TO USE IN ASPELL IN PYTHON

Download aspell-python from http://www.lfd.uci.edu/~gohlke/pythonlibs/ 
In cmd, navigate to c:\tools\python\Scripts and enter
pip install [path to the file aspell-python.whl]

Create symbolic link from C:\ProgramData\Aspell to  C:\tools\Aspell
Create symbolic link from C:\tools\Aspell\Dictionaries\en_US to C:\tools\Aspell\data

Start Python
import aspell
spell = aspell.Speller()
enc = spell.ConfigKeys()['encoding'][1]
print(spell.suggest('mispelling'.encode(enc)))


Credits:
http://nosq.com/2005/07/aspell-0603-for-win32/
https://github.com/WojciechMula/aspell-python/blob/master/windows.rst