Install into the  directory

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49713 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/buildit/build_llvm b/utils/buildit/build_llvm
index 51fdf35..c1df577 100755
--- a/utils/buildit/build_llvm
+++ b/utils/buildit/build_llvm
@@ -59,9 +59,11 @@
 # If the user has CC set in their environment unset it now
 unset CC
 
-DT_HOME=$DEST_DIR//Developer/usr
+DT_HOME=$DEST_DIR/Developer/usr
+DEST_ROOT="/Developer$DEST_ROOT"
 if [ "x$DEVELOPER_BIN" != "x" ]; then
-DT_HOME=$DEST_DIR/$DEVELOPER_DIR/usr
+    DT_HOME=$DEST_DIR/$DEVELOPER_DIR/usr
+    DEST_ROOT="/$DEVELOPER_DIR$DEST_ROOT"
 fi
 
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