ericbavier@centurylink.net writes:

> From: Eric Bavier <bavier@member.fsf.org>
>
> This lets qmake find qtwebkit components, allowing packages like python-pyqt
> to find qtwebkit and enable support.
>
> * gnu/packages/qt.scm (qtwebkit)[arguments]: Add "ECM_MKSPECS_INSTALL_DIR"
> to #:configure-flags.  Link with "--no-keep-memory".
> ---
>  gnu/packages/qt.scm | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/gnu/packages/qt.scm b/gnu/packages/qt.scm
> index d48769982..36f8aef69 100644
> --- a/gnu/packages/qt.scm
> +++ b/gnu/packages/qt.scm
> @@ -10,6 +10,7 @@
>  ;;; Copyright © 2017, 2018 Tobias Geerinckx-Rice <me@tobias.gr>
>  ;;; Copyright © 2018 Nicolas Goaziou <mail@nicolasgoaziou.fr>
>  ;;; Copyright © 2018 Hartmut Goebel <h.goebel@crazy-compilers.com>
> +;;; Copyright © 2018 Eric Bavier <bavier@member.fsf.org>
>  ;;;
>  ;;; This file is part of GNU Guix.
>  ;;;
> @@ -2171,7 +2172,15 @@ different kinds of sliders, and much more.")
>         #:configure-flags (list ;"-DENABLE_API_TESTS=TRUE"
>                                 "-DPORT=Qt"
>                                 "-DUSE_LIBHYPHEN=OFF"
> -                               "-DUSE_SYSTEM_MALLOC=ON")))
> +                               "-DUSE_SYSTEM_MALLOC=ON"
> +                               ;; XXX: relative dir installs to build dir?
> +                               (string-append "-DECM_MKSPECS_INSTALL_DIR="
> +                                              %output "/lib/qt5/mkspecs/modules")
> +                               ;; Sacrifice a little speed in order to link
> +                               ;; libraries and test executables in a
> +                               ;; reasonable amount of memory.
> +                               "-DCMAKE_SHARED_LINKER_FLAGS=-Wl,--no-keep-memory"
> +                               "-DCMAKE_EXE_LINKER_FLAGS=-Wl,--no-keep-memory")))
>      (home-page "https://www.webkit.org")
>      (synopsis "Web browser engine and classes to render and interact with web
>  content")

I've tested this, and this fixed the qtwebkit build for me, which
currently doesn't work on master. So I'm all for merging it.