Giovanni,

Giovanni Biscuolo 写道：
> If I try to build the package I get this error:
[…]

Your source tarball contains multiple gzipped files, one of which 
itself a tarball:

> metadata.gz
> data.tar.gz
> checksums.yaml.gz
> source is under 'checksums.yaml.gz'
> Backtrace:
>            2 (primitive-load 
>            "/gnu/store/0d1j4s7c1h8w6z700sxb88jqmjp?")
> In ice-9/eval.scm:
>     619:8  1 (_ #(#<directory (guile-user) 7ffff3bb3f00> 
>     "checksum?"))
> In unknown file:
>            0 (chdir "checksums.yaml.gz")
>
> ERROR: In procedure chdir:
> In procedure chdir: Not a directory

Guix's heuristic is very simple: chdir to the first (or last, 
dunno) file it finds in a tarball, because foo-1.2.3.tar.gz is 
expected to contain a single foo-1.2.3 directory.  It usually 
works, but here it fails, so you need to use url-fetch/tarball 
and/or further unpack the double-packed sources yourself in a 
custom phase.

Kind regards,

T G-R