Dld was a library package for the C programming language that performs dynamic link editing. Programs that use dld can add or remove compiled object code from a process anytime during its execution. Loading modules, searching libraries, resolving external references, and allocating storage for global and static data structures are all performed at run time. Dld was a GNU package, but has been withdrawn because its functionality is available (through the dlopen API) in modern Unix-like operating systems.