diff --git a/core/main.mk b/core/main.mk
index 1545670c9..c9f5b5fcd 100644
--- a/core/main.mk
+++ b/core/main.mk
@@ -102,43 +102,38 @@ $(error Directory names containing spaces not supported)
 endif
 
 
-# The windows build server currently uses 1.6.  This will be fixed.
-ifneq ($(HOST_OS),windows)
-
 # Check for the correct version of java
-java_version := $(shell java -version 2>&1 | head -n 1 | grep '[ "]1\.5[\. "$$]')
+java_version := $(shell java -version 2>&1 | head -n 1 | grep '[ "]1\.6[\. "$$]')
 ifeq ($(strip $(java_version)),)
 $(info ************************************************************)
 $(info You are attempting to build with the incorrect version)
 $(info of java.)
 $(info $(space))
 $(info Your version is: $(shell java -version 2>&1 | head -n 1).)
-$(info The correct version is: 1.5.)
+$(info The correct version is: 1.6.)
 $(info $(space))
 $(info Please follow the machine setup instructions at)
 $(info $(space)$(space)$(space)$(space)http://source.android.com/download)
 $(info ************************************************************)
-#$(error stop)
+$(error stop)
 endif
 
 # Check for the correct version of javac
-javac_version := $(shell javac -version 2>&1 | head -n 1 | grep '[ "]1\.5[\. "$$]')
+javac_version := $(shell javac -version 2>&1 | head -n 1 | grep '[ "]1\.6[\. "$$]')
 ifeq ($(strip $(javac_version)),)
 $(info ************************************************************)
 $(info You are attempting to build with the incorrect version)
 $(info of javac.)
 $(info $(space))
 $(info Your version is: $(shell javac -version 2>&1 | head -n 1).)
-$(info The correct version is: 1.5.)
+$(info The correct version is: 1.6.)
 $(info $(space))
 $(info Please follow the machine setup instructions at)
 $(info $(space)$(space)$(space)$(space)http://source.android.com/download)
 $(info ************************************************************)
-#$(error stop)
+$(error stop)
 endif
 
-endif # windows
-
 $(shell echo 'VERSIONS_CHECKED := $(VERSION_CHECK_SEQUENCE_NUMBER)' \
         > $(OUT_DIR)/versions_checked.mk)
 endif
diff --git a/envsetup.sh b/envsetup.sh
index c899c5ce2..7005ef670 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -99,6 +99,9 @@ function setpaths()
     if [ -n $ANDROID_BUILD_PATHS ] ; then
         export PATH=${PATH/$ANDROID_BUILD_PATHS/}
     fi
+    if [ -n $ANDROID_PRE_BUILD_PATHS ] ; then
+        export PATH=${PATH/$ANDROID_PRE_BUILD_PATHS/}
+    fi
 
     # and in with the new
     CODE_REVIEWS=
@@ -109,6 +112,15 @@ function setpaths()
     export ANDROID_BUILD_PATHS=:$(get_build_var ANDROID_BUILD_PATHS):$ANDROID_QTOOLS:$ANDROID_TOOLCHAIN:$ANDROID_EABI_TOOLCHAIN$CODE_REVIEWS
     export PATH=$PATH$ANDROID_BUILD_PATHS
 
+    unset ANDROID_JAVA_TOOLCHAIN
+    if [ -n "$JAVA_HOME" ]; then
+        export ANDROID_JAVA_TOOLCHAIN=$JAVA_HOME/bin
+    fi
+    export ANDROID_PRE_BUILD_PATHS=$ANDROID_JAVA_TOOLCHAIN
+    if [ -n "$ANDROID_PRE_BUILD_PATHS" ]; then
+        export PATH=$ANDROID_PRE_BUILD_PATHS:$PATH
+    fi
+
     unset ANDROID_PRODUCT_OUT
     export ANDROID_PRODUCT_OUT=$(get_abs_build_var PRODUCT_OUT)
     export OUT=$ANDROID_PRODUCT_OUT
@@ -134,6 +146,7 @@ function printconfig()
 function set_stuff_for_environment()
 {
     settitle
+    set_java_home
     setpaths
     set_sequence_number
 
@@ -1053,19 +1066,21 @@ function godir () {
     cd $T/$pathname
 }
 
-# Force JAVA_HOME to point to java 1.5 if it isn't already set
-if [ "$STAY_OFF_MY_LAWN" = "" ]; then
-    if [ ! "$JAVA_HOME" ]; then
-        case `uname -s` in
-            Darwin)
-                export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/1.5/Home
-                ;;
-            *)
-                export JAVA_HOME=/usr/lib/jvm/java-1.5.0-sun
-                ;;
-        esac
+# Force JAVA_HOME to point to java 1.6 if it isn't already set
+function set_java_home() {
+    if [ "$STAY_OFF_MY_LAWN" = "" ]; then
+        if [ ! "$JAVA_HOME" ]; then
+            case `uname -s` in
+                Darwin)
+                    export JAVA_HOME=/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home
+                    ;;
+                *)
+                    export JAVA_HOME=/usr/lib/jvm/java-6-sun
+                    ;;
+            esac
+        fi
     fi
-fi
+}
 
 # determine whether arrays are zero-based (bash) or one-based (zsh)
 _xarray=(a b c)