ImageMagick actually uses librsvg for conversions when converiting
from SVG (actually, it uses rsvg-convert). That causes the build to
fail with:

        WARNING: Error #1 when calling: /usr/bin/convert 
/home/mchehab/docs/Documentation/media/uapi/v4l/selection.svg 
/home/mchehab/docs/Documentation/output/latex/selection.pdf
        convert: delegate failed `'rsvg-convert' -o '%o' '%i'' @ 
error/delegate.c/InvokeDelegate/1919.
        convert: unable to open file `/tmp/magick-8883oOQfHzrA5trM': No such 
file or directory @ error/constitute.c/ReadImage/544.

Add the corresponding dependencies.

Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
 scripts/sphinx-pre-install | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/sphinx-pre-install b/scripts/sphinx-pre-install
index 817241c674d3..fc9891ce5c85 100755
--- a/scripts/sphinx-pre-install
+++ b/scripts/sphinx-pre-install
@@ -258,6 +258,7 @@ sub give_debian_hints()
                "convert"               => "imagemagick",
                "Pod::Usage"            => "perl-modules",
                "xelatex"               => "texlive-xetex",
+               "rsvg-convert"          => "librsvg2-bin",
        );
 
        if ($pdf) {
@@ -283,6 +284,7 @@ sub give_redhat_hints()
                "convert"               => "ImageMagick",
                "Pod::Usage"            => "perl-Pod-Usage",
                "xelatex"               => "texlive-xetex-bin",
+               "rsvg-convert"          => "librsvg2-tools",
        );
 
        my @fedora26_opt_pkgs = (
@@ -321,6 +323,7 @@ sub give_opensuse_hints()
                "convert"               => "ImageMagick",
                "Pod::Usage"            => "perl-Pod-Usage",
                "xelatex"               => "texlive-xetex-bin",
+               "rsvg-convert"          => "rsvg-view",
        );
 
        my @suse_tex_pkgs = (
@@ -357,6 +360,7 @@ sub give_arch_linux_hints()
                "dot"                   => "graphviz",
                "convert"               => "imagemagick",
                "xelatex"               => "texlive-bin",
+               "rsvg-convert"          => "extra/librsvg",
        );
 
        my @archlinux_tex_pkgs = (
@@ -380,6 +384,7 @@ sub give_gentoo_hints()
                "dot"                   => "media-gfx/graphviz",
                "convert"               => "media-gfx/imagemagick",
                "xelatex"               => "dev-texlive/texlive-xetex 
media-fonts/dejavu",
+               "rsvg-convert"          => "gnome-base/librsvg",
        );
 
        check_missing_file("/usr/share/fonts/dejavu/DejaVuSans.ttf",
@@ -458,6 +463,7 @@ sub check_needs()
        check_program("xelatex", 1) if ($pdf);
        check_program("dot", 1);
        check_program("convert", 1);
+       check_program("rsvg-convert", 1) if ($pdf);
 
        check_distros();
 
-- 
2.13.3

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