diff --git a/configure b/configure
index d3405c5e4d..8a237d84c8 100755
--- a/configure
+++ b/configure
@@ -4298,7 +4298,7 @@ fi
 ##
 ## Header files
 ##
-for ac_hdr in crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h netinet/tcp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/un.h sys/types.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h)
+for ac_hdr in crypt.h dld.h endian.h fp_class.h getopt.h ieeefp.h netinet/tcp.h pwd.h sys/ipc.h sys/pstat.h sys/select.h sys/sem.h sys/socket.h sys/un.h sys/types.h sys/un.h termios.h kernel/OS.h kernel/image.h SupportDefs.h
 do
 ac_safe=`echo "$ac_hdr" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&6