diff --git a/configure.ac b/configure.ac
index 12c3a73..7756c79 100644
--- a/configure.ac
+++ b/configure.ac
@@ -20,12 +20,6 @@ if [[ $AR = "no" ]] ; then
 fi
 
 # Checks for header files.
-m4_warn([obsolete],
-[The preprocessor macro `STDC_HEADERS' is obsolete.
-  Except in unusual embedded environments, you can safely include all
-  ISO C90 headers unconditionally.])dnl
-# Autoupdate added the next two lines to ensure that your configure
-# script's behavior did not change.  They are probably safe to remove.
 AC_CHECK_INCLUDES_DEFAULT
 AC_PROG_EGREP
 
@@ -34,19 +28,6 @@ AC_CHECK_HEADERS(fcntl.h sys/ioctl.h sys/time.h termio.h unistd.h)
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
 AC_TYPE_SIZE_T
-m4_warn([obsolete],
-[Update your code to rely only on HAVE_SYS_TIME_H,
-then remove this warning and the obsolete code below it.
-All current systems provide time.h; it need not be checked for.
-Not all systems provide sys/time.h, but those that do, all allow
-you to include it and time.h simultaneously.])dnl
-AC_CHECK_HEADERS_ONCE([sys/time.h])
-# Obsolete code to be removed.
-if test $ac_cv_header_sys_time_h = yes; then
-  AC_DEFINE([TIME_WITH_SYS_TIME],[1],[Define to 1 if you can safely include both <sys/time.h>
-	     and <time.h>.  This macro is obsolete.])
-fi
-# End of obsolete code.
 
 AC_C_BIGENDIAN
 AC_EGREP_CPP(yes,
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