diff --git a/Makefile.config b/Makefile.config
index c16e16774f0..390eb8a0d3d 100644
--- a/Makefile.config
+++ b/Makefile.config
@@ -30,8 +30,22 @@ LLVM_OBJ_DIR := /localhome/$(USER)
 #
 #LLVMGCCDIR := /home/vadve/lattner/cvs/gcc_install_x86
 
+# When this setting is set to true, programs in the llvm/test/Programs hierarchy
+# are not recompiled from source code.  Instead, the bytecode for the file is
+# pulled from the BYTECODE_REPOSITORY directory.  This can be useful when disk
+# space is limited or when you just don't want to spend time running the C
+# frontend.
+#
+#USE_PRECOMPILED_BYTECODE := 1
+
+# This path specifies the cannonical location of bytecode files for compiled
+# versions of the test/Programs/* programs.  This is used as the bytecode source
+# when USE_PRECOMPILED_BYTECODE is specified or when source code is not
+# available for the program (such as SPEC).
+#
+BYTECODE_REPOSITORY := /home/vadve/lattner/LLVMPrograms
+
 # Path to location for purify, this is only needed if you build with
 # ENABLE_PURIFY=1
 # 
 PURIFY = /usr/dcs/applications/purify/bin/purify
-