--- Makefile.PL.orig	2018-03-09 00:28:14.000000000 -0800
+++ Makefile.PL	2019-01-20 15:28:27.000000000 -0800
@@ -63,7 +63,7 @@
     if ($^O eq 'solaris') {
         $self->{CCFLAGS} .= ' -std=c99';
     } else {
-        $self->{CCFLAGS} .= ' -std=c89';
+        $self->{CCFLAGS} .= ' -std=c99';
     }
 
     # Need this define for localtime_r(), except on FreeBSD