From 179f5f058f2bc99ad08f7e5c856b7389f63893ab Mon Sep 17 00:00:00 2001
From: Antony Lee <anntzer.lee@gmail.com>
Date: Mon, 7 May 2018 10:19:00 -0700
Subject: [PATCH] Fix undefined name error in backend_pgf.

---
 lib/matplotlib/backends/backend_pgf.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
index 02e214655db0..66a3798c81a4 100644
--- a/lib/matplotlib/backends/backend_pgf.py
+++ b/lib/matplotlib/backends/backend_pgf.py
@@ -141,7 +141,8 @@ def _font_properties_str(prop):
     family = prop.get_family()[0]
     if family in families:
         commands.append(families[family])
-    elif family in system_fonts and rcParams["pgf.texsystem"] != "pdflatex":
+    elif (any(font.name == family for font in fm.fontManager.ttflist)
+          and rcParams["pgf.texsystem"] != "pdflatex"):
         commands.append(r"\setmainfont{%s}\rmfamily" % family)
     else:
         pass  # print warning?