diff -Nru a/examples/Makefile b/examples/Makefile
--- a/examples/Makefile	2018-10-04 14:39:25.000000000 +0200
+++ b/examples/Makefile	2018-10-16 05:43:11.625883120 +0200
@@ -131,7 +131,7 @@
 
 # Flags to enable code optimization by the compiler.
 ifeq ($(notdir $(CXX)),g++)
-OPT_CFLAGS = -Ofast -mtune=generic
+OPT_CFLAGS = -Ofast
 else
 ifeq ($(notdir $(CXX)),icpc)
 OPT_CFLAGS = -fast