Hi Ludo,

> I applied it but it fails for me at the end:
> 
> --8<---------------cut here---------------start------------->8---
> starting phase `reset-gzip-timestamps'
> Backtrace:
>            9 (primitive-load
> "/gnu/store/qaparaqbwqw4v0hwfd50s37mikz…")
> In ice-9/eval.scm:
>    191:35  8 (_ _)
> In ice-9/boot-9.scm:
>     829:9  7 (catch _ _ #<procedure 7ffff5bc0518 at /gnu/store/w3jl…>
> …)
> In srfi/srfi-1.scm:
>    863:16  6 (every1 #<procedure 7ffff4c111e0 at /gnu/store/w3jlc8p…>
> …)
> In /gnu/store/w3jlc8pk8416m7h677r5vq92b66h8cqd-module-
> import/guix/build/gnu-build-system.scm:
>    839:30  5 (_ _)
>     594:5  4 (reset-gzip-timestamps #:outputs _)
> In srfi/srfi-1.scm:
>     640:9  3 (for-each #<procedure process-directory (directory)>
> (#))
>     640:9  2 (for-each #<procedure reset-gzip-timestamp (file #:key…>
> …)
> In /gnu/store/w3jlc8pk8416m7h677r5vq92b66h8cqd-module-
> import/guix/build/utils.scm:
>    262:14  1 (reset-gzip-timestamp "/gnu/store/04j1kvzkx8n5ldbcbckh…"
> …)
> In unknown file:
>            0 (open "/gnu/store/04j1kvzkx8n5ldbcbckhcmbw4n3vzrwz-hel…" 
> …)
> 
> ERROR: In procedure open:
> In procedure open-fdes: Permission denied
> builder for `/gnu/store/xj20qjw2mgp2yc59hmafmkgg780n1ci7-helm-
> 0.9.0.drv' failed with exit code 1
> --8<---------------cut here---------------end--------------->8---
> 
> Could you take a look?

Weird, it used to work (I even installed it and used the plugin!) but
now I get this too. I would debug it but I have no idea what the error
means or what to look for, the project seems to get built ok (I can see
the generated LV2/VST plugins in the build directory).

> As an aside, the patch had been mangled on its way.  Could you send
> it
> as an attachment or with ‘git send-email’ next time?

Reattaching it as a patch, hopefully someone with more experience can
take it from here.

Alex