--- a/Makefile.in	2015-09-01 06:32:15.111441188 +0200
+++ b/Makefile.in	2015-09-01 06:32:56.001084480 +0200
@@ -125,7 +125,7 @@
 
 byteswap.h: byteswap.in.h
 	{ echo '/* DO NOT EDIT! GENERATED AUTOMATICALLY! */'; \
-	  cat $(srcdir)/byteswap.in.h; \
+	  cat $(top_srcdir)/byteswap.in.h; \
 	} > $@-t
 	mv -f $@-t $@