--- Makefile.orig	2016-09-05 13:31:39.000000000 -0400
+++ Makefile	2016-09-12 17:19:29.000000000 -0400
@@ -17,7 +17,7 @@
 RM = rm -f
 
 # On some platforms you might need to comment this out:
-CFLAGS += -std=c90 
+CFLAGS += -std=c99
 
 CFLAGS += -O3 -funroll-loops -fomit-frame-pointer