--- a/CONFIG
+++ b/CONFIG
@@ -458,7 +458,7 @@ TAR = tar
 
 #CFLAGS = -g -Wall
 # Linux, 386BSD, FreeBSD, SunOS:
-CFLAGS = -Wall -fno-strict-aliasing $(EXTRA_CFLAGS)
+CFLAGS = -Wall -fno-strict-aliasing -std=gnu17 $(EXTRA_CFLAGS)
 # SVR4:
 #CFLAGS = -O -Xa
 # NeXTSTEP
