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Configurations

When a developer fixes a bug or makes performance improvements
  • they typically modify several files   (a change set)
  • the changes made to the files may be interdependent
  • it may no longer be possible to mix-and-match different versions
Example:
  • a bug fix changes a.c 1.2→1.3 and b.c 2.7→2.8
  • the changes modified a function interface in a.c that is used in b.c
  • now, a system containing a.c,1.3 and b.c,2.7 will not compile