Source-code compatibility
Source code compatibility (source compatible) means that a program can run on computers (or operating systems), independently of binary code compatibility and that the source code is needed for portability.
The source code must be compiled before running, unless the computer(s) used have an interpreter for the language at hand. The term is also used for assembly language compatibility, where the source is a human-readable form of machine code that must be converted to numerical (i.e. executable) machine code by an assembler. This is different from binary code compatibility, where no recompilation or re assemblation is needed.
Source-compatibility is a major issue in the developing of computer programs. For example, most Unix systems are source compatible, as long as one uses only standard libraries. Microsoft Windows systems are source compatible across one major family (NT, 2000, XP or 95, 98, ME), with partial source compatibility between the two families.