Update README.md

README.md

@@ -19,22 +19,29 @@
 - [ToaruOS](https://toaruos.org)
 - [James Molloy's Kernel Development Tutorials](http://www.jamesmolloy.co.uk/tutorial_html/)
 
-#### Running
-**NOTE**: This has *only* been tested in an emulator. Real hardware might not like it.
+#### Building & Running
+~~**NOTE**: This has *only* been tested in an emulator. Real hardware might not like it.~~
+
+EDIT: this is not true anymore! [@parkerlreed has run this on a Thinkpad T510](https://github.com/jdah/tetris-os/issues/5#issuecomment-824507979).
 
 ##### Mac OS
+For the cross-compiler: `$ brew tap nativeos/i386-elf-toolchain && brew install i386-elf-binutils i386-elf-gcc`
 ```
 $ make iso
 $ qemu-system-i386 -drive format=raw,file=boot.iso -d cpu_reset -monitor stdio -device sb16 -audiodev coreaudio,id=coreaudio,out.frequency=48000,out.channels=2,out.format=s32
 ```
 
 ##### Unix-like
-Use the same command as Mac OS, but try with `pulseaudio` as the audio device.
+You should not need a cross-compiler in *most* cases as the `gcc` shipped in most linux distros will support `i386` targets.
+
+[If this isn't the case for you, read here about getting a cross-compiler.](https://wiki.osdev.org/GCC_Cross-Compiler)
+
+To run, the same command as Mac OS, but try with `pulseaudio` as the audio device.
 
 If you're having issues with no image showing up/QEMU freezing, this is a known bug with QEMU SB16 emulation under GTK. [Please read what @takaswie has written in #2 for a workaround](https://github.com/jdah/tetris-os/issues/2#issuecomment-824773889).
 
 ##### Windows
-Absolutely no idea.
+Absolutely no idea. Maybe try WSL.
 
 ##### Real hardware
 You probably know what you're doing if you're going to try this. Just burn `boot.iso` onto some bootable media and give it a go. If things break, try disabling all of the music (remove `#define ENABLE_MUSIC` in `main.c`) since you *probably* don't have something with a SB16 in it.