Re: Help with $SHELL in perl package for backuppc

[Jack Hill <jackhill@jackhill.us>]

On Wed, 21 Aug 2019, Jack Hill wrote:

> However, that fails to build because it tries to invoke /bin/sh (see full 
> build log at the end of this message).
>
> Line 2465 in configure.sh is suspicious as it reads:
>
> ```
> $SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
> ```
>
> I tried modifying the package definition to add a phase that sets the SHELL 
> variable, but that did not alter the build error. My package definition with 
> that change looks like:

After a more careful reading of configure.sh, the variable to set is 
CONFIG_SHELL, so a `(setenv "CONFIG_SHELL" (which "sh"))` does the trick. 
That means I now have the following package definition that builds.

```
(define-public perl-backuppc-xs
   (package
   (name "perl-backuppc-xs")
   (version "0.59")
   (source
     (origin
       (method url-fetch)
       (uri (string-append
              "mirror://cpan/authors/id/C/CB/CBARRATT/BackupPC-XS-"
              version
              ".tar.gz"))
       (sha256
         (base32
           "1rp57x3amv4g3sa1az83f5xyw25cj7hhvmj3jczrkmfbrpnxlkca"))))
   (build-system perl-build-system)
   (arguments
    '(#:phases
      (modify-phases %standard-phases
        (add-before 'configure 'set-environment-variables
          (lambda _
            (setenv "CONFIG_SHELL" (which "sh"))
            #t)))))
   (home-page
    "https://backuppc.github.io")
   (synopsis
     "Perl extension for BackupPC libraries")
   (description "to be written")
   (license gpl3+)))
```

Now on to the other backuppc components.

Best,
Jack