The idea is to use preprocessor macros to "hide" the code when compiling in platforms other than the Wii.
Following with the meta.xml from that example, the new one would be as follows:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<name>Compile Fancy Game</name>
<short_description>A short description.</short_description>
<long_description>A longer description for the entry that'll compile your code.</long_description>
That code would be pretty much like compiling your code in the PC like this:
bgdc boot.prg -o /apps/fancy_game/boot.dcb -D TARGET_WII
And in the code, where you do the mod_wpad import, you'd change it to:
And, a little bit below that:
#define wpad_is_ready(a) 0
#define wpad_info(a, b) 0
#define wpad_info_nunchuk(a,b) 0
#define wpad_info_classic(a,b) 0
#define wpad_info_guitar(a,b) 0
#define wpad_info_bb(a,b) 0
#define wpad_rumble(a,b) 0
The first block will only import mod_wpad in case the compiler defines the TARGET_WII macro, and that'll only happen in the Wii, if you adapted the code above.
The second block will void the wpad_* functions. For your program's logic, it'd be as if no Wiimote was connected.
Hope this helps you with the Nintendomax Wii Dev Competition 2011, where you can win a Nintendo 3DS console, and much more".