--- a/make-rules/shared-macros.mk	Tue Nov 12 13:24:56 2013 -0700
+++ b/make-rules/shared-macros.mk	Tue Nov 12 15:39:16 2013 -0800
@@ -277,13 +277,19 @@
 CC =		$(CC.$(COMPILER).$(BITS))
 CXX =		$(CXX.$(COMPILER).$(BITS))
 
-RUBY_VERSION =	1.8
-RUBY_LIB_VERSION =	1.8
+RUBY_VERSION =	1.9
+RUBY_LIB_VERSION =	1.9.1
 RUBY.1.8 =	/usr/ruby/1.8/bin/ruby
 RUBY.1.9 =	/usr/ruby/1.9/bin/ruby
-VENDOR_RUBY =	/usr/ruby/$(RUBY_VERSION)/lib/ruby/vendor_ruby/$(RUBY_LIB_VERSION)
 RUBY =		$(RUBY.$(RUBY_VERSION))
 
+# Note: Ruby 1.9 is 64-bit only; there is no 32-bit ruby 1.9.
+VENDOR_RUBY.32 = \
+	/usr/ruby/$(RUBY_VERSION)/lib/ruby/vendor_ruby/$(RUBY_LIB_VERSION)
+VENDOR_RUBY.64 = \
+	/usr/ruby/$(RUBY_VERSION)/lib/$(MACH64)/ruby/vendor_ruby/$(RUBY_LIB_VERSION)
+VENDOR_RUBY = $(VENDOR_RUBY.$(BITS))
+
 PYTHON_VENDOR_PACKAGES.32 = /usr/lib/python$(PYTHON_VERSION)/vendor-packages
 PYTHON_VENDOR_PACKAGES.64 = /usr/lib/python$(PYTHON_VERSION)/vendor-packages/64
 PYTHON_VENDOR_PACKAGES = $(PYTHON_VENDOR_PACKAGES.$(BITS))