Uses of such extensions have to be removed or replaced with comparable functions in the new operating system. However, programmers using standard interfaces also sometimes use operating system extensions or special capabilities that may not be present in the new operating system. Ideally, such a program needs only to be compiled for the operating system to which it is being ported. In general, programs that adhere to standard program interfaces such as the X/Open UNIX 95 standard C language interface are portable.
Porting is the task of doing any work necessary to make the computer program run in the new environment. Portability is a characteristic attributed to a computer program if it can be used in an operating systems other than the one in which it was created without requiring major rework.
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