Install OpenWrt-SDK:

Openwrt SDK

cd ~
git clone  https://github.com/sonnyyu/UsbRelay.git
cd UsbRelay
mips-openwrt-linux-uclibc-gcc   -O -Wall  -c usbrelay.c -o usbrelay.o
mips-openwrt-linux-uclibc-gcc  -O -Wall -I${CFLAGS} -c hiddata.c -o hiddata.o
mips-openwrt-linux-uclibc-gcc -L${LDFLAGS} -o usbrelay usbrelay.o hiddata.o -Wl,-rpath-link=${LDFLAGS} -lusb
mips-openwrt-linux-uclibc-strip usbrelay
file usbrelay