MANPATH
</programlisting>
   </para>

   <para>
    The environment variables <envar>PGHOST</envar> and <envar>PGPORT</envar>
    specify to client applications the host and port of the database
    server, overriding the compiled-in defaults. If you are going to
    run client applications remotely then it is convenient if every
    user that plans to use the database sets <envar>PGHOST</envar>.  This
    is not required, however; the settings can be communicated via command
    line options to most client programs.
   </para>
  </sect2>
 </sect1>

 <sect1 id="supported-platforms">
  <title>Supported Platforms</title>

  <para>
   A platform (that is, a CPU architecture and operating system combination)
   is considered supported by the <productname>PostgreSQL</productname> development
   community if the code contains provisions to work on that platform and
   it has recently been verified to build and pass its regression tests
   on that platform.  Currently, most testing of platform compatibility
   is done automatically by test machines in the
   <ulink url="https://buildfarm.postgresql.org/">PostgreSQL Build Farm</ulink>.
   If you are interested in using <productname>PostgreSQL</productname> on a platform
   that is not represented in the build farm, but on which the code works
   or can be made to work, you are strongly encouraged to set up a build
   farm member machine so that continued compatibility can be assured.
  </para>

  <para>
   In general, <productname>PostgreSQL</productname> can be expected to work on
   these CPU architectures: x86, PowerPC, S/390, SPARC, ARM, MIPS,
   and RISC-V, including
   big-endian, little-endian, 32-bit, and 64-bit variants where applicable.
  </para>

  <para>
   <productname>PostgreSQL</productname> can be expected to work on current
   versions of these operating systems: Linux, Windows,
   FreeBSD, OpenBSD, NetBSD, DragonFlyBSD, macOS, Solaris, and illumos.
   Other Unix-like systems may also work but are not currently
   being tested.  In most cases, all CPU architectures supported by
   a given operating system will work.  Look in
   <xref linkend="installation-platform-notes"/> below to see if
   there is information
   specific to your operating system, particularly if using an older system.
  </para>

  <para>
   If you have installation problems on a platform that is known
   to be supported according to recent build farm results, please report
   it to <email>pgsql-bugs@lists.postgresql.org</email>.  If you are interested
   in porting <productname>PostgreSQL</productname> to a new platform,
   <email>pgsql-hackers@lists.postgresql.org</email> is the appropriate place
   to discuss that.
  </para>

  <para>
   Historical versions of <productname>PostgreSQL</productname> or POSTGRES
   also ran on CPU architectures including Alpha, Itanium, M32R, M68K,
   M88K, NS32K, PA-RISC, SuperH, and VAX,
   and operating systems including 4.3BSD, AIX, BEOS,
   BSD/OS, DG/UX, Dynix, HP-UX, IRIX, NeXTSTEP, QNX, SCO, SINIX, Sprite, SunOS,
   Tru64 UNIX, and ULTRIX.
  </para>
 </sect1>

 <sect1 id="installation-platform-notes">
  <title>Platform-Specific Notes</title>

  <para>
   This section documents additional platform-specific issues
   regarding the installation and setup of PostgreSQL.  Be sure to
   read the installation instructions, and in
   particular <xref linkend="install-requirements"/> as well.  Also,
   check <xref linkend="regress"/> regarding the
   interpretation of regression test results.
  </para>

  <para>
   Platforms that are not covered here have no known platform-specific
   installation issues.
  </para>

  <sect2 id="installation-notes-cygwin">
   <title>Cygwin</title>

   <indexterm zone="installation-notes-cygwin">
    <primary>Cygwin</primary>
    <secondary>installation on</secondary>
   </indexterm>

   <para>
    PostgreSQL can be built using Cygwin, a Linux-like environment for
    Windows, but that method is inferior to the native Windows build