make file shouldn't say file built successfully if error occurs

Makefile

@@ -7,10 +7,10 @@ WATCHR ?= `which watchr`
 
 build:
 	@@if test ! -z ${LESS_COMPESSOR}; then \
-		sed 's/@DATE/'"${DATE}"'/' ${BOOTSTRAP_LESS} >${BOOTSTRAP_LESS}.tmp; \
-		lessc ${BOOTSTRAP_LESS}.tmp > ${BOOTSTRAP}; \
-		lessc ${BOOTSTRAP_LESS}.tmp > ${BOOTSTRAP_MIN} --compress; \
-		rm -f ${BOOTSTRAP_LESS}.tmp; \
+		sed 's/@DATE/'"${DATE}"'/' ${BOOTSTRAP_LESS} >${BOOTSTRAP_LESS}.tmp && \
+		lessc ${BOOTSTRAP_LESS}.tmp > ${BOOTSTRAP} && \
+		lessc ${BOOTSTRAP_LESS}.tmp > ${BOOTSTRAP_MIN} --compress && \
+		rm -f ${BOOTSTRAP_LESS}.tmp && \
 		echo "Bootstrap successfully built! - `date`"; \
 	else \
 		echo "You must have the LESS compiler installed in order to build Bootstrap."; \

bootstrap-1.3.0.css

@@ -6,7 +6,7 @@
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Designed and built with all the love in the world @twitter by @mdo and @fat.
- * Date: Sun Sep 11 22:02:16 PDT 2011
+ * Date: Mon Sep 12 14:28:15 PDT 2011
  */
 /* Reset.less
  * Props to Eric Meyer (meyerweb.com) for his CSS reset file. We're using an adapted version here	that cuts out some of the reset HTML elements we will never need here (i.e., dfn, samp, etc).