--- Makefile.orig	2018-11-14 13:17:08 UTC
+++ Makefile
@@ -21,7 +21,7 @@ VERSION=0.09.46
 # Codename "portable pressure producer"
 #
 
-CFLAGS += -Wall -Wextra -DVERSION='"$(VERSION)"' -O2 -std=gnu99
+CFLAGS += -Wall -Wextra -DVERSION='"$(VERSION)"' -O2 -std=gnu11 -pipe
 
 #
 # Pedantic flags