This is a guide about compiling GrafX2 for Windows using a Linux (Debian Strecth) system and mingw.
It may be useful for continuous integration, where Windows running CI slaves are not always an option.

= Install dependencies =

{{{
apt install \
	libz-mingw-w64 \
	libz-mingw-w64-dev \
	binutils-mingw-w64-i686 \
	gcc-mingw-w64-base \
	mingw-w64-common \
	mingw-w64-i686-dev \
	gcc-mingw-w64-i686 \
	mingw-w64-tools \
	win-iconv-mingw-w64-dev
}}}

= Build more dependencies =

Some of our dependencies are not available in Debian repos. So we must build them ourselves.

== libpng ==

{{{
wget ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng16/libpng-1.6.29.tar.gz
tar xvf libpng-1.6.29.tar.gz
cd libpng-1.6.29
./configure --host=i686-w64-mingw32 --prefix=/usr/local/cross-tools/i386-mingw32/
make
sudo make install
}}}

== freetype ==

{{{
wget http://download.savannah.gnu.org/releases/freetype/freetype-2.7.1.tar.gz
tar xvf freetype-2.7.1.tar.gz
cd freetype-2.7.1
./configure --host=i686-w64-mingw32 --prefix=/usr/local/cross-tools/i386-mingw32/
make
sudo make install
}}}

== SDL ==

{{{
wget http://libsdl.org/release/SDL-1.2.15.tar.gz
tar xvf SDL-1.2.15.tar.gz
cd SDL-1.2.15
./configure --host=i686-w64-mingw32
make
sudo make install
}}}

== SDL-image ==

{{{
wget https://www.libsdl.org/projects/SDL_image/release/SDL_image-1.2.12.tar.gz
tar xvf SDL_image-1.2.12.tar.gz
cd SDL_image-1.2.12
export PKG_CONFIG_PATH=/usr/local/cross-tools/i386-mingw32/lib/pkgconfig/
./configure --host=i686-w64-mingw32 --with-sdl-prefix=/usr/local/cross-tools/i386-mingw32
make
sudo make install
}}}

== SDL_ttf ==

{{{
wget https://www.libsdl.org/projects/SDL_ttf/release/SDL_ttf-2.0.11.tar.gz
tar xvf SDL_ttf-2.0.11.tar.gz
cd SDL_ttf-2.0.11
./configure --host=i686-w64-mingw32 --with-sdl-prefix=/usr/local/cross-tools/i386-mingw32/ --with-freetype-prefix=/usr/local/cross-tools/i386-mingw32
make
sudo make install
}}}


= Do the build =

{{{
make WIN32CROSS=1
}}}

The output is ../bin/grafx2.exe. It may need some extra DLLs. You can test it with wine32, it should run just fine.