How to cross-compile open-zwave library for asus rt-n16?

Question

Open-zwave lib link: http://code.google.com/p/open-zwave/source/browse/

Toolchain used: http://code.google.com/p/wl500g/downloads/list?can=3&q=hndtools-mipsel-uclibc-4.4.6-K26

Asus RT-N16 running on wl500g firmware: http://code.google.com/p/wl500g/

I've tried to do the following:

1. added toolchain path: PATH=$PATH:/home/user/hndtools-mipsel-uclibc-4.4.6-K26/bin/
2. сhecked out all needed files: svn checkout http://open-zwave.googlecode.com/svn/trunk/ open-zwave
3. added CROSS_COMPILE = mipsel-linux- to /open-zwave/cpp/build/linux/Makefile
4. tried to make: ~/open-zwave/cpp/build/linux$ make
5. got error: ../../hidapi/linux/hid.c:40:26: error: linux/hidraw.h: No such file or directory
6. replaced gcc with mipsel-linux-gcc, g++ with mipsel-linux-g++ at /home/user/open-zwave/cpp/hidapi/linux/Makefile
7. tried to make HIDAPI: ~/open-zwave/cpp/hidapi/linux$ make
8. got another error: hid-libusb.c:44:19: error: iconv.h: No such file or directory

How to cross-compile that?