This chapter explores the critical role of Xcode 14 and Swift 5.7 in package compilation, while clarifying how developers can target older platforms despite using newer tools. It delves into the intricacies of ABI stability, versioning challenges, and the complexities of platform compatibility, particularly as Swift continues to evolve. Additionally, the chapter discusses future possibilities like Windows integration and dockerized builds on Linux, highlighting the importance of standardized environments for effective machine management and testing.