updated for version 7.2-168
diff --git a/src/os_unix.h b/src/os_unix.h
index a337183..0a37763 100644
--- a/src/os_unix.h
+++ b/src/os_unix.h
@@ -53,7 +53,9 @@
 #endif
 
 #ifdef HAVE_UNISTD_H
-# include <unistd.h>
+# ifndef S_SPLINT_S  /* splint crashes on bits/confname.h */
+#  include <unistd.h>
+# endif
 #endif
 
 #ifdef HAVE_LIBC_H