The C RTL implements parts of the following standards:

    o  X/Open CAE Specification, System Interfaces and Headers, Issue
       4, Version 2, also known as XPG4 V2.

    o  X/Open CAE Specification, System Interfaces and Headers, Issue
       4, also known as XPG4.

    o  Standard for Information Technology - Portable Operating
       System Interface (POSIX) - Part 1: System Application Program
       Interface (API)-Amendment 2: Threads Extension [C Language],
       also known as POSIX 1003.1c-1995 or IEEE 1003.1c-1995.

    o  ISO/IEC 9945-2:1993 - Information Technology - Portable
       Operating System Interface (POSIX) - Part 2: Shell and
       Utilities, also known as ISO POSIX-2.

    o  ISO/IEC 9945-1:1990 - Information Technology - Portable
       Operating System Interface (POSIX) - Part 1: System
       Application Programming Interface (API) (C Language), also
       known as ISO POSIX-1.

    o  ANSI/ISO/IEC 9899:1999 - The C99 standard, published by ISO in
       December, 1999 and adopted as an ANSI standard in April, 2000.

    o  ISO/IEC 9899:1990-1994 - Programming Languages - C, Amendment
       1: Integrity, also known as ISO C, Amendment 1.

    o  ISO/IEC 9899:1990 - Programming Languages - C, also known as
       ISO C. The normative part is the same as X3.159-1989, American
       National Standard for Information Systems - Programming
       Language C, also known as ANSI C.