diff --git a/less/Makefile b/less/Makefile
index da6be71..1278c0a 100644
--- a/less/Makefile
+++ b/less/Makefile
@@ -1,18 +1,16 @@
 CSSDIR=../static/css/
 
 all :
-ifeq (,$(shell command -v lessc 2> /dev/null))
-$(error "less is not installed, please run install-less.sh")
-endif
+	@command -v lessc >/dev/null 2>&1 || { echo >&2 "less is not installed, please run install-less.sh."; exit 1; }
 	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