All source code is Public Domain.
Obtain the source code
git clone https://github.com/robertapengelly/as86.git
Building
BSD:
Make sure you have gcc and gmake installed then run gmake -f Makefile.unix.
Linux:
Make sure you have gcc and make installed then run make -f Makefile.unix.
macOS:
Make sure you have xcode command line tools installed then run make -f Makefile.unix.
Windows:
Make sure you have mingw installed and the location within your PATH variable then run mingw32-make.exe -f Makefile.w32.