In file included from file.h:36:0,
	from delta.cc:36:
	../gl/lib/unistd.h:135:3: error: #error "Please include config.h first."


--- a/src/delta.h
+++ b/src/delta.h
@@ -25,6 +25,7 @@
 #ifndef CSSC_DELTA_H
 #define CSSC_DELTA_H 1
 
+#include "config.h"
 #include "sid.h"
 #include "sccsdate.h"
 #include "mystring.h"