diff --git a/BUILDING.txt b/BUILDING.txt
index d35e3af889..d781c2ca0b 100644
--- a/BUILDING.txt
+++ b/BUILDING.txt
@@ -26,19 +26,11 @@ The easiest way to get an environment with all the appropriate tools is by means
 of the provided Docker config.
 This requires a recent version of docker (1.4.1 and higher are known to work).
 
-On Linux:
+On Linux / Mac:
     Install Docker and run this command:
 
     $ ./start-build-env.sh
 
-On Mac:
-    First make sure Virtualbox and docker toolbox are installed.
-    You can use docker toolbox as described in http://docs.docker.com/mac/step_one/.
-    $ docker-machine create --driver virtualbox \
-                            --virtualbox-memory "4096" hadoopdev
-    $ eval $(docker-machine env hadoopdev)
-    $ ./start-build-env.sh
-
 The prompt which is then presented is located at a mounted version of the source tree
 and all required tools for testing and building have been installed and configured.
 
diff --git a/start-build-env.sh b/start-build-env.sh
index e3d9f2ff95..08cdfb0975 100755
--- a/start-build-env.sh
+++ b/start-build-env.sh
@@ -21,9 +21,14 @@ cd "$(dirname "$0")" # connect to root
 
 docker build -t hadoop-build dev-support/docker
 
+USER_NAME=${SUDO_USER:=$USER}
+USER_ID=$(id -u "${USER_NAME}")
+
+if [ "$(uname -s)" = "Darwin" ]; then
+  GROUP_ID=100
+fi
+
 if [ "$(uname -s)" = "Linux" ]; then
-  USER_NAME=${SUDO_USER:=$USER}
-  USER_ID=$(id -u "${USER_NAME}")
   GROUP_ID=$(id -g "${USER_NAME}")
   # man docker-run
   # When using SELinux, mounted directories may not be accessible
@@ -51,10 +56,6 @@ if [ "$(uname -s)" = "Linux" ]; then
       done
     fi
   fi
-else # boot2docker uid and gid
-  USER_NAME=$USER
-  USER_ID=1000
-  GROUP_ID=50
 fi
 
 docker build -t "hadoop-build-${USER_ID}" - <<UserSpecificDocker