Use date instead of DATE, that's the POS*X way.

manveru · manveru · commit 49de3bef79ab · 2012-01-06T13:15:18.000+01:00
diff --git a/Makefile b/Makefile
@@ -1,5 +1,5 @@
 VERSION=1.4.0
-DATE=$(shell DATE)
+DATE=$(shell date)
 BOOTSTRAP = ./bootstrap.css
 BOOTSTRAP_MIN = ./bootstrap.min.css
 BOOTSTRAP_LESS = ./lib/bootstrap.less
