From ca2c9ed9fe56fb52e907d039636411e54f0efa50 Mon Sep 17 00:00:00 2001
From: Yudai NAKATA <yudai-nkt@outlook.jp>
Date: Fri, 24 Feb 2017 19:25:25 +0900
Subject: [PATCH] Simplify redundant fallbacks

Fix #261
---
 source/beamerthememetropolis.dtx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/source/beamerthememetropolis.dtx b/source/beamerthememetropolis.dtx
index ba629e4..c52c6ce 100644
--- a/source/beamerthememetropolis.dtx
+++ b/source/beamerthememetropolis.dtx
@@ -132,8 +132,8 @@
 % problems, hence we define them as no-ops if they are not defined yet.
 %
 %    \begin{macrocode}
-\ifx\tikzexternalenable\undefined \newcommand{\tikzexternalenable}{} \fi
-\ifx\tikzexternaldisable\undefined \newcommand{\tikzexternaldisable}{} \fi
+\providecommand{\tikzexternalenable}{}
+\providecommand{\tikzexternaldisable}{}
 %    \end{macrocode}
 %
 % \subsubsection{Component sub-packages}