Roel Janssen <roel@gnu.org> writes:

> Dear Guix,
>
> This patch modifies the recipe for pugixml to build a relocatable
> library.  This fixes a compilation issue with Darktable.
>
> Kind regards,
> Roel Janssen
>
>>>From 559b2c399f63beafe2d930cf75a71b7d575443cd Mon Sep 17 00:00:00 2001
> From: Roel Janssen <roel@gnu.org>
> Date: Thu, 2 Mar 2017 00:44:36 +0100
> Subject: [PATCH] gnu: pugixml: Build relocatable library.
>
> * gnu/packages/xml.scm (pugixml): Add "-shared -fPIC" to ensure
>   the library is relocatable.
> ---
>  gnu/packages/xml.scm | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/gnu/packages/xml.scm b/gnu/packages/xml.scm
> index b91471690..30f49a8bd 100644
> --- a/gnu/packages/xml.scm
> +++ b/gnu/packages/xml.scm
> @@ -752,7 +752,9 @@ the form of functions.")
>          "0fcgggry5x5bn0zhb09ij9hb0p45nb0sv0d9fw3cm1cf62hp9n80"))))
>      (build-system cmake-build-system)
>      (arguments
> -     `(#:tests? #f))                    ; no tests
> +     `(#:configure-flags '("-DCMAKE_CXX_FLAGS=-shared -fPIC"
> +                           "-DCMAKE_C_FLAGS=-shared -fPIC")
> +       #:tests? #f))                    ; no tests
>      (home-page "http://pugixml.org")
>      (synopsis "Light-weight, simple and fast XML parser for C++ with XPath support")
>      (description

LGTM. Pushed to master as 52c14bb6ec6fbd532b1e03a512d133e2499186b9.