$OpenBSD: patch-Makefile_in,v 1.1 2014/01/19 03:04:39 pascal Exp $
--- Makefile.in.orig	Fri Jan 17 18:58:52 2014
+++ Makefile.in	Fri Jan 17 18:59:05 2014
@@ -81,7 +81,7 @@ LIBS = @LIBS@
 
 # Set this to -g if you want to be able to debug the client, otherwise
 # use -O to have the compiler do some optimization instead.
-CFLAGS = @CFLAGS@
+CFLAGS = @CFLAGS@ @CPPFLAGS@
 
 # Set this to -s if you want the binary to be stripped.
 LDFLAGS = @LDFLAGS@
