Update configure.ac

Added ubuntu 13.10 and libboost1.54-all-dev incompatibility instruction to the existing no boost_sleep warning.

Author: Christopher Latham

configure.ac

@@ -395,7 +395,7 @@ LIBS="$TEMP_LIBS"
 fi
 
 if test x$boost_sleep != xyes; then
-  AC_MSG_ERROR(No working boost sleep implementation found)
+  AC_MSG_ERROR(No working boost sleep implementation found. If on ubuntu 13.10 with libboost1.54-all-dev remove libboost.1.54-all-dev and use libboost1.53-all-dev)
 fi
 
 BITCOIN_QT_INIT