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-rw-r--r--Makefile4
1 files 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)