diff --git a/tools/cmake/Makefile b/tools/cmake/Makefile
index 08e5a69ecf..f3712391a6 100644
--- a/tools/cmake/Makefile
+++ b/tools/cmake/Makefile
@@ -24,7 +24,8 @@ HOST_CONFIGURE_CMD := \
 	$(BASH) ./configure \
 		$(if $(MAKE_JOBSERVER),--parallel="$(MAKE_JOBSERVER)")
 
-HOST_CONFIGURE_VARS :=
+HOST_CONFIGURE_VARS += \
+	CXXFLAGS="$(HOST_CFLAGS)"
 
 HOST_CONFIGURE_ARGS := \
 	--prefix=$(STAGING_DIR_HOST)