--- a/src/Makefile
+++ b/src/Makefile
@@ -92,7 +92,7 @@ DEBUG_CFLAGS = -Dcimg_use_vt100 -Dcimg_v
 
 # Flags to enable optimizations.
 ifeq ($(IS_GCC),yes)
-OPT_CFLAGS = -O3 -mtune=generic # -fno-tree-pre # -ffast-math
+OPT_CFLAGS = -O3 #-mtune=generic # -fno-tree-pre # -ffast-math
 endif
 ifeq ($(CC),icc)
 OPT_CFLAGS = -O3 -ipo -no-prec-div -override-limits
