diff -Nru a/examples/Makefile b/examples/Makefile
--- a/examples/Makefile	2018-11-30 14:12:18.000000000 +0100
+++ b/examples/Makefile	2018-12-03 14:55:48.173856583 +0100
@@ -146,7 +146,7 @@
 # Flags to enable code optimization by the compiler.
 OPT_CFLAGS = -Ofast
 ifdef IS_GCC
-OPT_CFLAGS = -Ofast -mtune=generic
+OPT_CFLAGS = -Ofast
 endif
 ifdef IS_ICPC
 OPT_CFLAGS = -fast