From aaad65fbd82cc6e89ae4546f6cb462c6206a2fb9 Mon Sep 17 00:00:00 2001
From: Manuela Kuhn <36827019+manuelakuhn@users.noreply.github.com>
Date: Tue, 13 Jul 2021 15:12:10 +0200
Subject: [PATCH] graphviz: add python dependency to fix installation (#24852)

The bootstrap script in the autoreconf procedure calls the
gen_version.py script which requires python 3.6 to process f-strings.
---
 var/spack/repos/builtin/packages/graphviz/package.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/var/spack/repos/builtin/packages/graphviz/package.py b/var/spack/repos/builtin/packages/graphviz/package.py
index 7274f79ad1e..70d19853846 100644
--- a/var/spack/repos/builtin/packages/graphviz/package.py
+++ b/var/spack/repos/builtin/packages/graphviz/package.py
@@ -116,6 +116,8 @@ class Graphviz(AutotoolsPackage):
     depends_on('sed', type='build')
     depends_on('libtool', type='build')
     depends_on('pkgconfig', type='build')
+    # to process f-strings used in gen_version.py
+    depends_on('python@3.6:', when='@2.47:', type='build')
 
     conflicts('~doc',
               when='@:2.45',