求助？openwrt编译求助

[qq1005896486]

在openwrt编译的时候，
Makefile在openwrt/package/pop3client/目录下面，

include $(TOPDIR)/rules.mk

PKG_NAME:=pop3client
PKG_RELEASE:=1

PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk

define Package/pop3client
SECTION:=utils
CATEGORY:=Utilities
TITLE:=pop3client -- prints a snarky message
DEPENDS:=+libstdcpp
endef

define Package/pop3client/description
If you can't figure out what this program does, you're probably
brain-dead and need immediate medical attention.
endef


define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)
$(CP) ./src/* $(PKG_BUILD_DIR)/
endef

define Package/pop3client/install
$(INSTALL_DIR) $(1)/bin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/pop3client $(1)/bin/
endef

$(eval $(call BuildPackage,pop3client))

工程在openwrt/package/tools/src/目录下，
其中，工程的源代码.cpp放在openwrt/package/pop3client/src/src/目录下，
工程编译的结果放在.cpp的上层目录，也就是openwrt/package/pop3client/src/。
在执行编译的时候 出错。
src/pop3session.o:(.rodata._ZTIN11Pop3Session11ServerErrorE[typeinfo for Pop3Session::ServerError]+0x0): undefined reference to `vtable for __cxxabiv1::__si_class_type_info'
collect2: ld returned 1 exit status