1 files changed, 17 insertions, 6 deletions
diff --git a/test/overhead.c b/test/overhead.c
index 4fdc6d3..d95fed4 100644
--- a/test/overhead.c
+++ b/test/overhead.c
@@ -7,14 +7,25 @@
  *
  * Purpose:	Creates a chunked dataset and measures the storage overhead.
  */
-#include <ctype.h>
-#include <fcntl.h>
-#include <hdf5.h>
-#include <stdlib.h>
-#include <sys/stat.h>
-#include <unistd.h>
 
+/* See H5private.h for how to include headers */
+#undef NDEBUG
 #include <H5config.h>
+
+#ifdef STDC_HEADERS
+#   include <ctype.h>
+#   include <fcntl.h>
+#   include <stdlib.h>
+#   include <sys/stat.h>
+#endif
+
+#ifdef HAVE_UNISTD_H
+#   include <sys/types.h>
+#   include <unistd.h>
+#endif
+
+#include <hdf5.h>
+
 #ifndef HAVE_ATTRIBUTE
 #   undef __attribute__
 #   define __attribute__(X) /*void*/