IPOD_MOUNT_DIR environment variable
Use pkg-config
Should be gpod/itdb.h
Fix target
Call itdb_filename_ipod2fs before joining mount dir and ipod_path. Because itdb_filename_ipod2fs replace all ':' to '/', so on windows:

F::iPod_Control:iTunes:Music:...

becomes

F//iPod_Control/iTunes/Music/...
Merge pull request #1 from mattn/mount_point

Windows port