Index: swig/CCache/Makefile.in
===================================================================
--- swig.orig/CCache/Makefile.in	2019-06-09 00:27:28.831228908 +0200
+++ swig/CCache/Makefile.in	2019-06-09 00:28:53.502543301 +0200
@@ -13,6 +13,7 @@
 
 CC=@CC@
 CFLAGS=@CFLAGS@ -I.
+CPPFLAGS=@CPPFLAGS@
 SWIG=swig
 SWIG_LIB=../$(srcdir)/../Lib
 EXEEXT=@EXEEXT@
