0) use a Mac (I'm sorry, I really am)
1) install the official Apple iOS SDK

2) build a sysroot/ of Telesphoreo by:

    a) downloading and extracting this tarball:
    http://test.saurik.com/cydia/sysroot-2.tgz

       -or-

    b) doing the following crazy stunts:
        i) install Cydia Substrate (in beta)
        ii) install Fink (the only sane choice)
        iii) activate Fink (. /sw/bin/init.sh)
        iv) fink install bash ldid tar wget
        v) run ./sysroot.sh and wait a bit

3) type "make" to compile the executable