--- a/tool/Makefile.am	Tue Sep 11 22:16:10 2018 +0200
+++ b/tool/Makefile.am	Wed Sep 12 21:22:46 2018 +0200
@@ -133,4 +133,5 @@
 	-Wall -DREV=$(REV) \
 	-fno-strict-aliasing
 
+ethercat_CFLAGS = $(ethercat_CXXFLAGS)
 #------------------------------------------------------------------------------