THRIFT-4720: documenting breaking changes, minor cleanup
diff --git a/lib/cpp/CMakeLists.txt b/lib/cpp/CMakeLists.txt
index 9ea82c3..9e36665 100755
--- a/lib/cpp/CMakeLists.txt
+++ b/lib/cpp/CMakeLists.txt
@@ -17,7 +17,10 @@
# under the License.
#
-include_directories(SYSTEM "${Boost_INCLUDE_DIRS}")
+# Remove the following once lib/cpp no longer depends on boost headers:
+include(BoostMacros)
+REQUIRE_BOOST_HEADERS()
+
include_directories(src)
# SYSLIBS contains libraries that need to be linked to all lib targets