From: Martin Mares <mj@ucw.cz>
Date: Thu, 31 May 2018 14:14:00 +0000 (+0200)
Subject: Fail if we are not compiled by an ε-TeX compatible engine
X-Git-Tag: v1.99~1^2~46
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=6e7c89c40b9e33883a2bcf76cc3b8bdf0b0ac59a;p=ucwmac.git

Fail if we are not compiled by an ε-TeX compatible engine
---

diff --git a/ucwmac.tex b/ucwmac.tex
index 86dc5e5..a3d5f4d 100644
--- a/ucwmac.tex
+++ b/ucwmac.tex
@@ -1,5 +1,5 @@
 % The UCW Macro Collection (a successor of mjmac.tex)
-% Written by Martin Mares <mj@ucw.cz> in 2010--2013 and placed into public domain
+% Written by Martin Mares <mj@ucw.cz> in 2010--2018 and placed into public domain
 % -------------------------------------------------------------------------------
 
 %%% Prolog %%%
@@ -7,6 +7,10 @@
 % We'll use internal macros of plain TeX
 \catcode`@=11
 
+\ifx\eTeXversion\undefined
+\errmessage{ucwmac requires the e-TeX engine or its successor}
+\fi
+
 %%% PDF output detection %%%
 
 \newif\ifpdf