diff --git a/src/configure.in b/src/configure.in
index 35ecde3..b98af27 100644
--- a/src/configure.in
+++ b/src/configure.in
@@ -2964,52 +2964,10 @@
 	AC_MSG_RESULT(yes); AC_DEFINE(HAVE_SYSCONF),
 	AC_MSG_RESULT(not usable))
 
-dnl Our own version of AC_CHECK_SIZEOF(int); fixes a bug when sizeof() can't
-dnl be printed with "%d", and avoids a warning for cross-compiling.
-
-AC_MSG_CHECKING(size of int)
-AC_CACHE_VAL(ac_cv_sizeof_int,
-	[AC_TRY_RUN([
-#include <stdio.h>
-#if STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#endif
-main()
-{
-  FILE *f=fopen("conftestval", "w");
-  if (!f) exit(1);
-  fprintf(f, "%d\n", (int)sizeof(int));
-  exit(0);
-}],
-	    ac_cv_sizeof_int=`cat conftestval`,
-	    AC_MSG_ERROR([failed to determine sizeof(int)]),
-	    AC_MSG_ERROR([failed to compile test program]))])
-AC_MSG_RESULT($ac_cv_sizeof_int)
-AC_DEFINE_UNQUOTED(SIZEOF_INT, $ac_cv_sizeof_int)
-
-dnl Figure out sizeof(time_t) so that it can be used in #ifdef.
-AC_MSG_CHECKING(size of time_t)
-AC_CACHE_VAL(ac_cv_sizeof_time_t,
-	[AC_TRY_RUN([
-#include <stdio.h>
-#if STDC_HEADERS
-# include <stdlib.h>
-# include <stddef.h>
-#endif
-#include <time.h>
-main()
-{
-  FILE *f=fopen("conftestval", "w");
-  if (!f) exit(1);
-  fprintf(f, "%d\n", (int)sizeof(time_t));
-  exit(0);
-}],
-	    ac_cv_sizeof_time_t=`cat conftestval`,
-	    AC_MSG_ERROR([failed to determine sizeof(time_t)]),
-	    AC_MSG_ERROR([failed to compile test program]))])
-AC_MSG_RESULT($ac_cv_sizeof_time_t)
-AC_DEFINE_UNQUOTED(SIZEOF_TIME_T, $ac_cv_sizeof_time_t)
+AC_CHECK_SIZEOF([int])
+AC_CHECK_SIZEOF([long])
+AC_CHECK_SIZEOF([time_t])
+AC_CHECK_SIZEOF([off_t])
 
 dnl Make sure that uint32_t is really 32 bits unsigned.
 AC_MSG_CHECKING([uint32_t is 32 bits])