X/Open Portability Guide (XPG)

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A precursor to POSIX and the Single UNIX Specification.

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2026-10-10

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1. ▲

   POSIX Standards pubs.opengroup.org

   The Portable Operating System Interface is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems.

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   site
2. ▲

   SUS unix.org

   Single UNIX Specification.

   site link ↗
   site
3. ▲

   SoX sourceforge.net

   site link ↗
   site
4. ▲

   Uxn 100r.co

   A portability layer for graphical applications.

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   site
5. ▲

   XPA web.archive.org

   DOS executable packer.

   site link ↗
   site
6. ▲

   eXosip savannah.nongnu.org

   eXtended osip is a mature C library for abstracting the SIP protocol.

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   site

Standards › Operating Systems: “A precursor to POSIX and the Single UNIX Specification.”