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-rwxr-xr-xbin/impressive-display5
1 files changed, 5 insertions, 0 deletions
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