diff --git a/src/fd_control.c b/src/fd_control.c
index 4c6f38ab81c36edaabacecbe92509406b85236cc..3dc0ef6f1ed6a179f9297626c4360ed8cde1ba70 100644
--- a/src/fd_control.c
+++ b/src/fd_control.c
@@ -7,6 +7,15 @@
 #include "global.h"
 #include "error.h"
 #else
+#ifndef _LARGEFILE_SOURCE
+#  define _FILE_OFFSET_BITS 64
+#  define _LARGEFILE_SOURCE 1
+#  define _LARGEFILE64_SOURCE 1
+#endif /* !_LARGERFILE_SOURCE */
+/* HPUX needs these too... */
+#ifndef __STDC_EXT__
+#  define __STDC_EXT__
+#endif /* !__STDC_EXT__ */
 #undef DEBUG
 #endif