diff --git a/hello-buck-cxx/.buckconfig b/hello-buck-cxx/.buckconfig
index 500096c..f402597 100644
--- a/hello-buck-cxx/.buckconfig
+++ b/hello-buck-cxx/.buckconfig
@@ -1,9 +1,14 @@
-
 [cxx]
   cxxppflags="-D HELLOSTRING=\"Buck\""
 
-[cxx#other_platform]
-  cxxppflags="-D HELLOSTRING=\"Chuck\""
+<file:cxx-other-platform/cxx-other-platform.include>
+
+#
+# Include the following configuration file if it 
+# exists. If the file does not exist, do nothing.
+# (Note the `?` prefix.)
+#
+<?file:future-platform/future-platform.include>
 
 [parser]
   default_build_file_syntax = skylark
diff --git a/hello-buck-cxx/cxx-other-platform/cxx-other-platform.include b/hello-buck-cxx/cxx-other-platform/cxx-other-platform.include
new file mode 100644
index 0000000..769739d
--- /dev/null
+++ b/hello-buck-cxx/cxx-other-platform/cxx-other-platform.include
@@ -0,0 +1,3 @@
+[cxx#other_platform]
+  cxxppflags="-D HELLOSTRING=\"Chuck\""
+