Install Perl 5.22.1 on AmigaOS with perlamiga

perlamiga documents a Perl 5.22.1 port for AmigaOS 4.1, and running it cleanly means following its installer and shell rules exactly. You finish with a working install, a reliable way to launch scripts through abc-shell, and a checklist for the port's known traps.

The local reference is the perlamiga(1) manpage shipped by perl-doc 5.38.2-3.2ubuntu0.6. That package version supplies the documentation here, but the port it describes is specifically Perl 5.22.1. Allow about 30 minutes if the SDK and archive are ready.

You need:

• AmigaOS 4.1 update 6 with updates applied.
• newlib.library 53.28 or newer.
• The AmigaOS SDK, preferably.
• abc-shell, or another suitable sh port, since Perl expects a Unix-like shell for external commands and environment handling.

1. Check the platform prerequisites

Before unpacking anything, confirm the host matches the port's assumptions. The manpage calls out AmigaOS 4.1 update 6, the updated system libraries, and the SDK. The decisive library requirement is newlib.library version 53.28 or greater.

The exact command for checking a library version depends on the AmigaOS tools installed on your system, so do not substitute a guessed command and treat it as proof. Use the version information from your system management tools, then check that sh resolves to abc-shell or another suitable shell.

2. Install the supplied archive

Get the prebuilt archive from os4depot.net and unpack it into a temporary location; RAM: suits this staging area. Then run the install script supplied by the archive, either from a shell or through its icon:

10.AmigaOS4:> sh
/AmigaOS4> cd RAM:perl-staging
/AmigaOS4> install-script-name

Replace RAM:perl-staging and install-script-name with the paths and filename actually present in the archive. The manpage is explicit that the provided installer must do the installation: doing it by hand can duplicate binaries and break the links the installer preserves.

Once the installer reports completion, remove the temporary archive only after you are satisfied that Perl starts; that deletion is optional and the only cleanup in this guide. If the installation fails, keep the staging files so you can inspect the installer output and rerun it after fixing the prerequisite.

3. Decide how to handle older Perl ports

This is a fresh port and is not compatible with the earlier Perl 5.8 or 5.16.3 ports. Third-party modules installed for those versions need reinstalling or rebuilding for Perl 5.22.1.

If you need both versions, rename the older executable before installing the new one, for example:

Rename SDK:Local/C/perl SDK:Local/C/perl516
Rename SDK:Local/C/perl58 SDK:Local/C/perl58

Use the actual executable paths on your system rather than copying these literally. Do not rename a file merely because it has a familiar name: inspect the installation first, and keep a copy or backup if the old interpreter is still needed. Renaming an executable changes how scripts find it, so update any local launchers that referred to the old name.

4. Launch a script through abc-shell

Start Perl from abc-shell, not directly from the AmigaOS shell, for the best results. abc-shell supplies the file globbing, pattern expansion and environment variables Perl expects:

10.AmigaOS4:> sh
/AmigaOS4> perl path:to/myprog arg1 arg2 arg3

Replace path:to/myprog and the arguments with your script. The manpage's example uses an Amiga-style path for the program: relative paths still follow the port's Unix-style rules, while File::Spec recognises Amiga-style absolute paths.

A script can also use a #! line so abc-shell launches it directly:

#!SDK:Local/C/perl

AmigaOS requires the script bit to be set for this to work. Test it from abc-shell with the script name and its arguments:

10.AmigaOS4:> sh
/AmigaOS4> myprog arg1 arg2 arg3

If direct execution fails, check the script bit and the interpreter path first, then invoke the same file explicitly with perl. That separates a launcher problem from a Perl problem.

5. Account for the known limitations

• Older abc-shell versions can crash nested piped programs. The manpage names abc-shell 53.2 as affected and recommends installing a later version when available. Do not diagnose an application as broken until you have reproduced the pipeline with a current shell.
• newlib.library 53.30 and earlier mishandles some backslash escapes, including \", \n and \t. Unexpected argument text may be a library compatibility issue rather than a quoting error in the Perl program, so check the library version before adding layers of escaping.
• A Perl subprocess opened with open FH, "command |" uses a minimal popen() routine, and its process ID cannot be used with waitpid. Design code that uses this form without relying on that PID, or choose a different process strategy when you need normal child-process control.

6. Verify the installation

Use the installed documentation lookup from abc-shell to confirm the port's own documentation is available:

10.AmigaOS4:> sh
/AmigaOS4> perldoc perlamiga