[bug#63610] [PATCH 2/3] self: Build against "graphviz-minimal".

["Ludovic Courtès" <ludo@gnu.org>]

Fixes <https://issues.guix.gnu.org/63050>.
Reported by Andreas Enge <andreas@enge.fr>.

* guix/self.scm (%packages): Change "graphviz" to refer to
"graphviz-minimal".  Add "font-ghostscript".
(info-manual): Define 'font-ghostscript'.
[build]: Set XDG_DATA_DIRS.
---
 guix/self.scm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/guix/self.scm b/guix/self.scm
index 74c953bd50..9e0aa82698 100644
--- a/guix/self.scm
+++ b/guix/self.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2017-2022 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2017-2023 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2020 Martin Becze <mjbecze@riseup.net>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -72,7 +72,8 @@ (define %packages
       ("gettext-minimal"    . ,(ref 'gettext 'gettext-minimal))
       ("gcc-toolchain"      . ,(ref 'commencement 'gcc-toolchain))
       ("glibc-utf8-locales" . ,(ref 'base 'glibc-utf8-locales))
-      ("graphviz"           . ,(ref 'graphviz 'graphviz))
+      ("graphviz"           . ,(ref 'graphviz 'graphviz-minimal))
+      ("font-ghostscript"   . ,(ref 'ghostscript 'font-ghostscript))
       ("texinfo"            . ,(ref 'texinfo 'texinfo)))))
 
 (define (specification->package name)
@@ -404,6 +405,9 @@ (define (info-manual source)
   (define graphviz
     (specification->package "graphviz"))
 
+  (define font-ghostscript
+    (specification->package "font-ghostscript"))
+
   (define glibc-utf8-locales
     (specification->package "glibc-utf8-locales"))
 
@@ -444,6 +448,9 @@ (define (info-manual source)
 
           ;; Build graphs.
           (mkdir-p (string-append #$output "/images"))
+
+          (setenv "XDG_DATA_DIRS"                 ;fonts needed by 'dot'
+                  #+(file-append font-ghostscript "/share"))
           (for-each (lambda (dot-file)
                       (invoke #+(file-append graphviz "/bin/dot")
                               "-Tpng" "-Gratio=.9" "-Gnodesep=.005"
-- 
2.40.1