1 files changed, 4 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index 945b56c..4bff12c 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ book.html: build.sh main.xml $(chapters)
 	sh build.sh && \
 	ls -l $@
 
-book.pdf: main.xml $(chapters)
+book.pdf: main.xml $(chapters) .dblatex
 	dblatex \
 		--pdf \
 		-x'-xinclude' \
@@ -19,6 +19,9 @@ view.pdf: book.pdf
 view.html: book.html
 	xdg-open $<
 
+.dblatex:
+	which dblatex 2>/dev/null || echo "ERROR: 'dblatex' REQUIRED, SEE http://github.com/vbatts/SlackBuilds/ FOR THE SlackBuild"
+
 .PHONY: clean
 clean:
 	rm -f book.html book.pdf