Include <openssl/err.h> for the ERR_error_string function.  This

improves compatibility with future compilers which will not accept

implicit funcction declarations by default.

diff --git a/configure b/configure

index fe4e606e91010520..694801b2a93659af 100755

--- a/configure

+++ b/configure

@@ -5199,6 +5199,8 @@ else

       cat confdefs.h - <<_ACEOF >conftest.$ac_ext

 /* end confdefs.h.  */

 #include <openssl/ssl.h>

+      #include <openssl/err.h>

+

 int

 main ()

 {

diff --git a/configure.ac b/configure.ac

index 09dbb7a1e8d35c84..abd599c90e3ef0d7 100644

--- a/configure.ac

+++ b/configure.ac

@@ -559,7 +559,9 @@ if test -n "$WITH_OPENSSL" -a "$sc_cv_have_openssl_ssl_h" = 'yes'; then

       else

 	LIBS="$LIBS -lssl -lcrypto"

       fi

-      AC_TRY_LINK([#include <openssl/ssl.h>],

+      AC_TRY_LINK([#include <openssl/ssl.h>

+      #include <openssl/err.h>

+      ],

        [SSL_library_init();ERR_error_string()],

        [sc_cv_have_libssl='yes'],

        [ LIBS="$LIBS -lcrypto"