RTP（Real-timeTransportProtocol） in linux on fpga

I want plant RTP on FPGA based on linux.

On PC, we use command

" g++ -o example1 example1.cpp -I /usr/local/include/jrtplib/ -ljrtp"

to compile a file.

but in FPGA linux we used toolchian nios2-linux-gnu-g++,so i use

"nios2-linux-gnu-g++ -o example1 example1.cpp -I /usr/local/include/jrtplib/ -ljrtp"

but it says

/usr/work/nios2-linux/toolchain-mmu/x86-linux2/bin/../lib/gcc/nios2-linux-gnu/4.1.2/../../../../nios2-linux-gnu/bin/ld: skipping incompatible /usr/work/nios2-linux/toolchain-mmu/x86-linux2/bin/../lib/gcc/nios2-linux-gnu/4.1.2/libjrtp.so when searching for -ljrtp

/usr/work/nios2-linux/toolchain-mmu/x86-linux2/bin/../lib/gcc/nios2-linux-gnu/4.1.2/../../../../nios2-linux-gnu/bin/ld: skipping incompatible /usr/work/nios2-linux/toolchain-mmu/x86-linux2/bin/../lib/gcc/nios2-linux-gnu/4.1.2/libjrtp.a when searching for -ljrtp

/usr/work/nios2-linux/toolchain-mmu/x86-linux2/bin/../lib/gcc/nios2-linux-gnu/4.1.2/../../../../nios2-linux-gnu/bin/ld: cannot find -ljrtp

I think it must be because the library is built based on gxx,not nios2-linux-gnu-gXX ,how can i get a proper lib

thanks

wangweike