From 74aa9dde5e0893febb5cc0d82de51ee065f8de34 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 24 Mar 2015 18:03:21 +0100
Subject: Fix extend (not override) metadata with ISBN number.

---
 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 6d23644..285e3ee 100644
--- a/Makefile
+++ b/Makefile
@@ -40,10 +40,10 @@ args_latex += -V frontmatter=yes -V classoption=titlepage -V classoption=$(if $(
 #flavors = a4 book ebook
 flavors = a4 ebook
 args_a4 = -V papersize=a4paper -V fontsize=10pt -V classoption=oneside
-args_a4 = -M isbn="978-90-823692-1-2"
+args_a4 += -M isbn="978-90-823692-1-2"
 args_book = -V papersize=b5paper -V fontsize=10pt -V classoption=twoside
 args_ebook = -V papersize=ebook -V fontsize=12pt -V classoption=oneside -V classoption=openany
-args_ebook = -M isbn="978-90-823692-0-5"
+args_ebook += -M isbn="978-90-823692-0-5"
 
 all: $(flavors:%=$(stem)-%.pdf)
 
-- 
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