Editing POSIX (section)

====Compliant via compatibility layer====
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The following are not officially certified as POSIX compatible, but they conform in large part to the standards by implementing POSIX support via some sort of compatibility feature (usually translation libraries, or a layer atop the kernel). Without these features, they are usually non-compliant.

*[[AmigaOS]] (through the ixemul library or [[vbcc]]_PosixLib<ref>{{Cite web|url=http://aminet.net/package/dev/c/vbcc_PosixLib|title=Aminet - dev/C/Vbcc_PosixLib.lha}}</ref>)
*[[eCos]]&nbsp;– POSIX is part of the standard distribution, and used by many applications. 'external links' section below has more information.
*[[IBM i]] (through the [[IBM i#PASE|PASE]] compatibility layer)<ref>{{cite web|title=Programming IBM PASE for i|url=https://www.ibm.com/docs/de/ssw_ibm_i_73/rzalf/rzalfpdf.pdf|website=ibm.com|publisher=IBM|date=2013|access-date=25 November 2021}}</ref>
*[[MorphOS]] (through the built-in ixemul library)
*[[OpenVMS]] (through optional POSIX package)<ref>{{cite web|url=https://peren.com/fips151-2_peren_vpl.htm|title=FIPS 151-2 Conformance Validated Products List|publisher=Perennial Test Lab|access-date=14 August 2022}}</ref>
*[[Plan 9 from Bell Labs]] APE - ANSI/POSIX Environment<ref name="APE">{{cite web|url=http://plan9.bell-labs.com/sys/doc/ape.html |title=APE — ANSI/POSIX Environment|publisher=Bell Labs|work=Plan 9 documents|archive-url=https://web.archive.org/web/20170601064807/http://plan9.bell-labs.com/sys/doc/ape.html|archive-date=1 June 2017}}</ref>
*[[RIOT (operating system)|RIOT]] (through optional POSIX module)
*[[Symbian|Symbian OS]] with [[PIPS]] (PIPS Is POSIX on Symbian)
*[[VAXELN]] (partial support of 1003.1 and 1003.4 through the VAXELN POSIX runtime library)<ref>{{cite manual|url=http://www.bitsavers.org/pdf/dec/vax/realtime/EK-RPTSS-TM-004_Real-Time_Products_Technical_Summary_Dec92.pdf|title=Realtime Products Technical Summary, Fifth Edition|publisher=[[Digital Equipment Corporation]]|date=December 1992|access-date=8 December 2021}}</ref>
*[[Architecture of Windows NT|Windows NT kernel]] when using Microsoft [[Windows Services for UNIX|SFU]] 3.5 or [[Subsystem for UNIX-based Applications|SUA]]
**[[Windows 2000|Windows 2000 Server or Professional with Service Pack 3 or later]]. To be POSIX compliant, one must activate optional features of Windows NT and Windows 2000 Server.<ref name="MS">{{cite web|url=http://www.microsoft.com/technet/archive/ntwrkstn/reskit/poscomp.mspx|title=Chapter 29 - POSIX Compatibility|work=MS Windows NT Workstation Resource Kit|publisher=Microsoft|archive-url=https://web.archive.org/web/20080115185233/http://www.microsoft.com/technet/archive/ntwrkstn/reskit/poscomp.mspx|archive-date=15 January 2008}}</ref>
**[[Windows XP|Windows XP Professional with Service Pack 1 or later]]
**[[Windows Server 2003]]
**[[Windows Server 2008]] and Ultimate and Enterprise versions of [[Windows Vista]]
**[[Windows Server 2008 R2]] and Ultimate and Enterprise versions of [[Windows 7]]
**albeit deprecated, still available for [[Windows Server 2012]] and Enterprise version of [[Windows 8]]