From 0b40f415c807e54a828594f0406c9f3617a54246 Mon Sep 17 00:00:00 2001
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
Date: Fri, 1 Apr 2016 15:44:28 +0200
Subject: Handle situations where the 'bc' command line calculator is not
 installed.

---
 bin/impressive-display | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bin/impressive-display b/bin/impressive-display
index 08d9da1..c289e2d 100755
--- a/bin/impressive-display
+++ b/bin/impressive-display
@@ -184,6 +184,11 @@ function cleanup {
 
 function pdf_is_portrait {
 
+	if ! which bc 1>/dev/null; then
+		echo "WARNING: The 'bc' command line tool is not installed on this system."
+		return -1
+	fi
+
 	check_pdffile=$1
 	if [ -n "$check_pdffile" ] && [ -r "$check_pdffile" ]; then
 
-- 
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