HADOOP-11154. Update BUILDING.txt to state that CMake 3.0 or newer is required on Mac. Contributed by Chris Nauroth.

(cherry picked from commit 8dc4e9408f4cd9a50cd58aee574f3b03c3a33b31)

BUILDING.txt

@@ -8,7 +8,7 @@ Requirements:
 * Maven 3.0 or later
 * Findbugs 1.3.9 (if running findbugs)
 * ProtocolBuffer 2.5.0
-* CMake 2.6 or newer (if compiling native code)
+* CMake 2.6 or newer (if compiling native code), must be 3.0 or newer on Mac
 * Zlib devel (if compiling native code)
 * openssl devel ( if compiling native hadoop-pipes )
 * Internet connection for first build (to fetch all Maven and Hadoop dependencies)

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -557,6 +557,9 @@ Release 2.6.0 - UNRELEASED
     HADOOP-11049. javax package system class default is too broad (Sangjin Lee
     via jlowe)
 
+    HADOOP-11154. Update BUILDING.txt to state that CMake 3.0 or newer is
+    required on Mac. (cnauroth)
+
 Release 2.5.1 - 2014-09-05
 
   INCOMPATIBLE CHANGES