Subject: [bug#36387] [PATCH] gnu: mesa: Fix detection of wayland-scanner pkg-config file.

From: Maxim Cournoyer <[email-masked]>
Date: Sat, 13 Nov 2021 20:22:55 -0500

Hello,

Kei Kebreau <[email-masked]> writes:

> * gnu/packages/gl.scm (mesa)[arguments]: Add "patch-meson-build" phase.
> ---
>  gnu/packages/gl.scm | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/gnu/packages/gl.scm b/gnu/packages/gl.scm
> index 96e7fc7165..78f7401f20 100644
> --- a/gnu/packages/gl.scm
> +++ b/gnu/packages/gl.scm
> @@ -337,6 +337,15 @@ also known as DXTn or DXTC) for Mesa.")
>                         (("'u_format_test',") ""))
>                       #t)))
>                 '())
> +         (add-after
> +           'unpack 'patch-meson-build
> +           (lambda _
> +             ;; Without this, meson fails with the following error:
> +             ;; Dependency "wayland-scanner" not found, tried pkgconfig.
> +             (substitute* "meson.build"
> +               (("dependency\\('wayland-scanner', native: true\\)")
> +                "dependency('wayland-scanner')"))
> +             #t))
>           (add-before
>             'configure 'fix-dlopen-libnames
>             (lambda* (#:key inputs outputs #:allow-other-keys)

Was this fixing a build failure of mesa itself?  Or does it manifest
when building other packages depending on mesa?

Given the patch is 2 years old, I'm guessing it went stale?

Thanks,

Maxim