When I ran IconFamily.m 0.9.4 through /Developer/Extras/64BitConversion/ConvertCocoa64, the script made 60 changes, mostly changing int to NSInteger. A few of these I'm unsure about, such as (NSInteger)fourByteCode. In addition, there were a few warnings: #warning 64BIT: Inspect use of long, #warning 64BIT: Check formatting arguments. I'm confused about whether 0.9.4 is 64-bit safe.