add compatibility header

test/cunit_compat.h

+/*
+  cunit_compat.h
+
+  Compatibility macros to handle different versions of CUnit,
+  in particular the changes to the suite struct introduced in
+  version 2.1-3
+
+  Copyright (c) J.J. Green 2016
+*/
+
+#ifndef CUNIT_COMPAT_H
+#define CUNIT_COMPAT_H
+
+/* default to 2.1-3 or later */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifndef CUNIT_213
+#define CUNIT_213 1
+#endif
+
+#if CUNIT_213
+#define CU_Suite_Entry(a, b, c, d) {(a), (b), (c), NULL, NULL, (d)}
+#else
+#define CU_Suite_Entry(a, b, c, d) {(a), (b), (c), (d)}
+#endif
+
+#endif

test/tests.c

@@ -11,11 +11,12 @@
 
 #include <CUnit/CUnit.h>
 
+#include "cunit_compat.h"
 #include "tests_pia.h"
 
 static CU_SuiteInfo suites[] =
   {
-    {"pia", NULL, NULL, tests_pia},
+    CU_Suite_Entry("pia", NULL, NULL, tests_pia),
     CU_SUITE_INFO_NULL,
   };