From 0f4f5d64a74ebe28817b242d0d6489e7e68b5afe Mon Sep 17 00:00:00 2001
From: Hanson Char <hanson.char@gmail.com>
Date: Thu, 20 Jun 2024 20:42:19 -0700
Subject: [PATCH] Add missing preamble to PhlogeneticTree.lua

---
 .../pgf/gd/phylogenetics/PhylogeneticTree.lua | 27 ++++++++++---------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/PhylogeneticTree.lua b/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/PhylogeneticTree.lua
index 242ccf183..8841176e3 100644
--- a/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/PhylogeneticTree.lua
+++ b/tex/generic/pgf/graphdrawing/lua/pgf/gd/phylogenetics/PhylogeneticTree.lua
@@ -40,18 +40,21 @@ declare {
   documentation = [["
     ...
   "]],
-  examples = [["
-    \tikz \graph [phylogenetic tree layout, upgma,
-                  distance matrix={
-                    0 4 9 9 9 9 9
-                    4 0 9 9 9 9 9
-                    9 9 0 2 7 7 7
-                    9 9 2 0 7 7 7
-                    9 9 7 7 0 3 5
-                    9 9 7 7 3 0 5
-                    9 9 7 7 5 5 0}]
-      { a, b, c, d, e, f, g };
-  "]]
+  examples = {
+    options = [[ preamble=\usetikzlibrary{graphs,graphdrawing} \usegdlibrary{phylogenetics} ]],
+    [[
+      \tikz \graph [phylogenetic tree layout, upgma,
+                    distance matrix={
+                      0 4 9 9 9 9 9
+                      4 0 9 9 9 9 9
+                      9 9 0 2 7 7 7
+                      9 9 2 0 7 7 7
+                      9 9 7 7 0 3 5
+                      9 9 7 7 3 0 5
+                      9 9 7 7 5 5 0}]
+        { a, b, c, d, e, f, g };
+    ]]
+  }
 }