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+AppImages are only for Linux based systems:
+
+  https://appimage.org/
+
+The AppImageKit AppImage can be downloaded from:
+
+  https://github.com/AppImage/AppImageKit/releases
+
+It is recommended to build AppImages on older distributions:
+
+  https://docs.appimage.org/introduction/concepts.html#build-on-old-systems-run-on-newer-systems
+
+At the time of this document, CentOS 6 is the one of the oldest supported Linux
+distributions with the oldest libc version.
+
+Use a custom configured PostgreSQL build with minimal options enabled to reduce
+library dependency support.  Part of this reason is to make it easier to
+include libraries with compatible licences.  Part of the reason is to be able
+to build libpq with minimal development dependencies for PostgreSQL, since the
+purpose is just to build a pg_top AppImage.  At least version PostgreSQL 10
+should be used so that PGHOST can be defined in the AppRun script to search
+multiple potential unixsock directories if no PGHOST is defined in the user's
+environment.
+
+At the time of this document, PostgreSQL 10 was configured with the following
+options::
+
+  ./configure --without-ldap --without-readline --without-zlib --without-gssapi
+
+Don't forget you may have to set both PATH and LD_LIBRARY_PATH appropriately
+depending on where the custom build of PostgreSQL is installed.