Fixing GPU cuda host compiler

configure

@@ -227,6 +227,11 @@ do
        conf_options="$conf_options -DSE_CLASS3=ON"
        ;;
     gpu)
+        if [ x"$CXX" == x"" ]; then
+                conf_options="$conf_options"
+        else
+                conf_options="$conf_options -DCUDA_HOST_COMPILER=$CXX"
+        fi
        conf_options="$conf_options -DENABLE_GPU=ON"
        ;;
     *) ac_unrecognized_opts="$ac_unrecognized_opts$ac_unrecognized_sep--enable-$ac_useropt_orig"