From 4522205507f7d259b39eec24463a0d2f8b91d139 Mon Sep 17 00:00:00 2001
From: Jan Tojnar <jtojnar@gmail.com>
Date: Sat, 14 Dec 2019 17:35:47 +0100
Subject: [PATCH] python3.pkgs.anytree: make graphviz optional
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It is a runtime dependency that produces dependency loop:

    anytree → graphviz → pango → glib → gtk-doc → anytree
---
 pkgs/development/python-modules/anytree/default.nix | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkgs/development/python-modules/anytree/default.nix b/pkgs/development/python-modules/anytree/default.nix
index 8fccf590a96..712944568f2 100644
--- a/pkgs/development/python-modules/anytree/default.nix
+++ b/pkgs/development/python-modules/anytree/default.nix
@@ -5,6 +5,7 @@
 , fetchpatch
 , nose
 , six
+, withGraphviz ? true
 , graphviz
 , fontconfig
 }:
@@ -18,7 +19,7 @@ buildPythonPackage rec {
     sha256 = "05736hamjv4f38jw6z9y4wckc7mz18ivbizm1s3pb0n6fp1sy4zk";
   };
 
-  patches = [
+  patches = lib.optionals withGraphviz [
     (substituteAll {
       src = ./graphviz.patch;
       inherit graphviz;
@@ -33,11 +34,14 @@ buildPythonPackage rec {
     six
   ];
 
-  # Fontconfig error: Cannot load default config file
-  preCheck = ''
+  # tests print “Fontconfig error: Cannot load default config file”
+  preCheck = lib.optionalString withGraphviz ''
     export FONTCONFIG_FILE=${fontconfig.out}/etc/fonts/fonts.conf
   '';
 
+  # circular dependency anytree → graphviz → pango → glib → gtk-doc → anytree
+  doCheck = withGraphviz;
+
   checkPhase = ''
     runHook preCheck