diff --git a/less/Makefile b/less/Makefile
index e81258a..5e51b4d 100644
--- a/less/Makefile
+++ b/less/Makefile
@@ -1,26 +1,21 @@
-ifeq ($(shell which lessc),/usr/bin/lessc)
-	LESSC=/usr/bin/lessc
-else ifeq ($(shell which lessc),/usr/local/bin/lessc)
-	LESSC=/usr/local/bin/lessc
-else ifeq ($(shell which lessc),/bin/lessc)
-	LESSC=/bin/lessc
-else
-	LESSC=node_modules/.bin/lessc
+LESSC := $(shell command -v lessc 2> /dev/null)
+
+ifndef LESSC
+	$(error "less is not installed, please run install-less.sh")
 endif
-export LESSC
 
 CSSDIR=../static/css/
 
 all :
 	$(LESSC) app.less --clean-css="--s1 --advanced" $(CSSDIR)write.css
 	$(LESSC) fonts.less --clean-css="--s1 --advanced" $(CSSDIR)fonts.css
 	$(LESSC) icons.less --clean-css="--s1 --advanced" $(CSSDIR)icons.css
 
 install :
 	./install-less.sh
 	$(MAKE) all
 
 clean :
 	rm -f write.css
 	rm -f fonts.css
 	rm -f icons.css