diff --git a/configure.in b/configure.in
index ed8698a..a578527 100644
--- a/configure.in
+++ b/configure.in
@@ -1534,6 +1534,9 @@
 AC_HEADER_TIME
 AC_STRUCT_TM
 AC_STRUCT_TIMEZONE
+AC_STRUCT_ST_RDEV
+AC_STRUCT_ST_BLKSIZE
+AC_STRUCT_ST_BLOCKS
 
 AC_MSG_CHECKING(for time.h that defines altzone)
 AC_CACHE_VAL(ac_cv_header_time_altzone,