--- a/src/Makefile
+++ b/src/Makefile
@@ -119,7 +119,7 @@ DEBUG_CFLAGS = -ansi -pedantic -Dcimg_ve
 
 # Flags to enable optimizations.
 ifeq ($(notdir $(CC)),g++)
-OPT_CFLAGS = -O2 -mtune=generic
+OPT_CFLAGS = -O2 
 else
 ifeq ($(notdir $(CC)),icpc)
 OPT_CFLAGS = -fast
