How to install and configure FFTW-3.3.3 that can be compiled by "nios2-linux-gcc"

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Hello, 

 I want to use fftw-3.3.3 in my nios2-uclinux , I install it follow "fftw installation user manual"：  (1)first, verify whether it works well on linux (centos-6.4)  [root@localhost fftw-3.3.3]# ./configure [root@localhost fftw-3.3.3]# make [root@localhost fftw-3.3.3]# make install  Edit the PATH:  export path=$path: /root/opt/nios2/bin:/usr/local/bin export c_include_path=/usrlocal/include export library_path=/usr/local/lib   After that, I write and compile a testfft.c:  [root@localhost root]# gcc testfft.c -lm -lfftw3 -i/usr/local/bin [root@localhost root]# ./a.out  --the output is correct! it can work on my linux:).  (2) change to "nios2-linux-gcc"  [root@localhost root]# nios2-linux-gcc -v --the version is 3.4.6, it's ok. [root@localhost fftw-3.3.3]# make clean --clean fftw pre-install [root@localhost fftw-3.3.3]# ./configure cc="nios2-linux-gcc" --host=nios2 [root@localhost fftw-3.3.3]# make  [root@localhost fftw-3.3.3]# make install ........install........  then copy the "fftw3.f , fftw3.f03 , fftw3.h , fftw3l.f03 ,fftw3q.f03" from " /usr/local/include" folder to nios2 toolchain folder ".../nios2/include"  copy the the "fftw-wisedom, fftw-wisdom-to-conf" from "/usr/local/bin" to nios2 toolchain ".../nios2/bin"folder. copy the "libfftw3.a, libfftw3.la" from "/usr/local/lib" to nios2 toolchain ".../nios2/lib"  (3) compile testfft.c again:  [root@localhost root]# nios2-linux-gcc testfft.c -lm -lfftw3 -i/usr/local/bin  /root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(mapflags.o)(.text+0x49c): in function `fftw_mapflags': : undefined reference to `log' /root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(mapflags.o)(.text+0x4b8): in function `fftw_mapflags': : undefined reference to `log' /root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(trig.o)(.text+0xf0): in function `real_cexp': : undefined reference to `cos' /root/opt/nios2/bin/../lib/gcc/nios2-linux-uclibc/3.4.6/../../../../nios2-linux-uclibc/lib/libfftw3.a(trig.o)(.text+0x10c): in function `real_cexp': : undefined reference to `sin' collect2: ld returned 1 exit status   --something is wrong, "nios2-linux-gcc" can't compile it .:confused:  the nios2-linux is "nios2-linux-20090929.tar" the nios2gcc is "nios2gcc-20080203.tar.bz2"  --the nios2-linux is ok, i have verified it on my fpga hardware.  maybe the configuration is wrong, so would somebody give me some suggestions? thank you very much!