> tmp = g_strdup_printf(" #include %s<libvirt/%s.files>\n", ifexists, ctl->uuid); > + tmp_local = g_strdup_printf(" #include %s<libvirt/%s.local>\n", ifexists, ctl->uuid); > + new_tmp = g_strconcat(tmp, tmp_local, NULL); > + g_free(tmp); > + tmp = g_steal_pointer(&new_tmp); While this works it is kinda convoluted. Instead of introducing a new g_strdup_printf call just extend the current one tmp = g_strdup_printf(" #include %s<libvirt/%s.files>\n" \ " #include %s<libvirt/%s.local>\n", ifexists, ctl->uuid, ifexists, ctl->uuid);