1 0) use a Mac (I'm sorry, I really am)
2 1) install the official Apple iOS SDK
3 2) install Fink (the only sane choice)
4 3) activate Fink (. /sw/bin/init.sh)
5 4) sudo fink install bash ldid tar wget xz
6 5) run ./sysroot.sh and wait a bit
7 6) type "make" to compile the executable