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      1 llvm/lib/Support/Unix README
      2 ===========================
      3 
      4 This directory provides implementations of the lib/System classes that
      5 are common to two or more variants of UNIX. For example, the directory
      6 structure underneath this directory could look like this:
      7 
      8 Unix           - only code that is truly generic to all UNIX platforms
      9   Posix        - code that is specific to Posix variants of UNIX
     10   SUS          - code that is specific to the Single Unix Specification
     11   SysV         - code that is specific to System V variants of UNIX
     12 
     13 As a rule, only those directories actually needing to be created should be
     14 created. Also, further subdirectories could be created to reflect versions of
     15 the various standards. For example, under SUS there could be v1, v2, and v3
     16 subdirectories to reflect the three major versions of SUS.
     17