diff --git a/Makefile b/Makefile
index 4118c80..c8402d2 100644
--- a/Makefile
+++ b/Makefile
@@ -1,3 +1,7 @@
+PRESENTATIONS=$(patsubst %.tex, %.pdf, $(wildcard presentations/*.tex))
+
+all: ${PRESENTATIONS}
+
 .ONESHELL:
 presentations/%.pdf : presentations/%.tex
 	cd presentations