diff --git a/Jamrules b/Jamrules
index 11dc70c559..5eda8bc91f 100644
--- a/Jamrules
+++ b/Jamrules
@@ -16,10 +16,12 @@ path-global BOOST_ROOT : $($(gTOP)) ;
 
 # Tell the build system where to find the rest of the build
 # system installation (e.g. toolset descriptions, variants)
-BOOST_BUILD_INSTALLATION ?= $(BOOST_ROOT)/tools/build ;
+BOOST_BUILD_PATH ?= $(BOOST_ROOT)/tools/build ;
 
 # This variable will surely need to be set specific to your installation, though
 # we may be able to provide better defaults for some systems. It is used by the
 # toolset(s) that use STLport
 STLPORT_ROOT ?= c:/downloads/STLPort-0601 ;
 
+# The current version of Boost.
+BOOST_VERSION = 1.27.0 ;