ActivePerl 5.26 Release Notes

Welcome, and thank you for downloading ActivePerl. This release corresponds to Perl version 5.26.3.

The following platforms are supported by this release:

  • Linux: glibc 2.15 or later (x64), e.g. Ubuntu 12.04 or later

  • macOS 10.9 or later (x64)

  • Windows Server 2008, 7, Server 2012, 8 (x86 and x64), and 10.

For a chronological list of changes included in this and past releases, see the ActivePerl 5.26 Change Log.


Perl 5.26 is not binary compatible with Perl 5.24 and earlier releases. In particular, do not attempt to use extensions or PPM packages built for ActivePerl 2400 and older series builds with ActivePerl 2600 series builds. Please check "Incompatible Changes" in perl5260delta for known source level incompatibilities between the Perl 5.26 releases and the earlier release series.

Known Issues


  • The fork() emulation has known limitations. See perlfork for a detailed summary. In particular, fork() emulation will not work correctly with extensions that are either not thread-safe, or maintain internal state that cannot be cloned in the pseudo-child process. This caveat currently applies to extensions such as Tk and Storable.

  • It is possible to install different major versions at the same time as long as you are careful to use different directories. Do not install a newer major version of ActivePerl on top of an older version. It is best to uninstall any older versions and then install this one.

  • 5.26.x minor version updates can be installed seamlessly on top of an existing 5.26.0 (or later) version. The installer will first remove files from the old version and then install the new version. If you changed the default installation directory, you will need to select a custom install and then choose the directory containing the previous 5.26.x version.

Further Information

The Perl distribution comes with extensive documentation. On Unix platforms, all the standard documentation is installed as man pages under the Perl install location. The location of the man pages may need to be added to the MANPATH environment variable in order to access them. For example, in the C shell:

    % setenv MANPATH /opt/ActivePerl-5.26/man:$MANPATH

The documentation is installed in HTML format on all platforms. If ActivePerl was installed in /opt/ActivePerl-5.26 then the HTML documentation would be located in /opt/ActivePerl-5.26/html.

On Windows, the standard documentation along with Windows-specific Perl documentation is installed in HTML format, and is accessible from the "Start" menu.

Updated versions of the HTML documentation will always be available at the ActiveState website:

Reporting Problems

Please report any bugs you encounter with this release to ActiveState Support:

Please be sure to include detailed information about the platform in your message.

As far as possible, please ensure that there is enough information in the report to reproduce the bug elsewhere. It also helps to submit a minimal test case that exhibits the bug.

ActiveState Platform Community Tier Support Policy

The two most recent stable releases of ActivePerl are available for free download. This corresponds to the Perl community's own version support policy.

Whenever the underlying Perl version becomes "unsupported" by the Perl community itself, support for the corresponding ActivePerl versions will be limited to Business Tier and Enterprise Tier customers.

You can continue to use older ActivePerl releases indefinitely under the terms of the Community Edition license, but you won't be able to download the installers from ActiveState.