diff --git a/configure.in b/configure.in
index 62456ac..548d272 100644
--- a/configure.in
+++ b/configure.in
@@ -135,7 +135,7 @@
 AC_CHECK_HEADERS(bstring.h endian.h lastlog.h login.h maillock.h netdb.h netgroup.h netinet/in_systm.h paths.h poll.h pty.h shadow.h security/pam_appl.h sys/bitypes.h sys/bsdtty.h sys/cdefs.h sys/poll.h sys/select.h sys/stropts.h sys/sysmacros.h sys/time.h sys/ttcompat.h stddef.h util.h utmp.h utmpx.h)
 
 # Checks for library functions.
-AC_CHECK_FUNCS(arc4random b64_ntop bindresvport_af clock freeaddrinfo gai_strerror getaddrinfo getnameinfo getrusage innetgr md5_crypt mkdtemp openpty rresvport_af setenv seteuid setlogin setproctitle setreuid snprintf strlcat strlcpy updwtmpx vsnprintf vhangup _getpty __b64_ntop)
+AC_CHECK_FUNCS(arc4random b64_ntop bcopy bindresvport_af clock freeaddrinfo gai_strerror getaddrinfo getnameinfo getrusage innetgr md5_crypt memmove mkdtemp openpty rresvport_af setenv seteuid setlogin setproctitle setreuid snprintf strlcat strlcpy updwtmpx vsnprintf vhangup _getpty __b64_ntop)
 
 AC_CHECK_FUNC(login, 
 	[AC_DEFINE(HAVE_LOGIN)],
@@ -381,6 +381,20 @@
 	AC_DEFINE(HAVE_SIZE_T)
 fi
 
+AC_CACHE_CHECK([for ssize_t], ac_cv_have_ssize_t, [
+	AC_TRY_COMPILE(
+		[
+#include <sys/types.h>
+		],
+		[ ssize_t foo; foo = 1235; ],
+		[ ac_cv_have_ssize_t="yes" ],
+		[ ac_cv_have_ssize_t="no" ]
+	)
+])
+if test "x$ac_cv_have_ssize_t" = "xyes" ; then
+	AC_DEFINE(HAVE_SSIZE_T)
+fi
+
 
 AC_CACHE_CHECK([for struct sockaddr_storage], ac_cv_have_struct_sockaddr_storage, [
 	AC_TRY_COMPILE(