--- ./src/Makefile.in.orig	2014-08-16 19:38:31.000000000 -0400
+++ ./src/Makefile.in	2014-08-16 19:38:57.000000000 -0400
@@ -34,7 +34,7 @@
 LDFLAGS         = @LDFLAGS@
 SYS_INCLUDES    = @SYS_INCLUDES@
 INCLUDE         = -I. -I./include -I$(top_include)
-CFLAGS          = @CFLAGS@ $(INCLUDE) $(SYS_INCLUDES) $(DEFS)
+CFLAGS          = @CFLAGS@ $(INCLUDE) $(SYS_INCLUDES) @CPPFLAGS@ $(DEFS)
 
 # Libraries
 
