how to make clm3.5 on own server

[yixu1102@gmail_com]

i want to make the clm3.5 on my server while I have installed mpi and netcdf.
make:
/home/yy/clm3.5/bld/mkSrcfiles > /home/yy/clm3.5/bld/Srcfiles
/home/yy/clm3.5/bld/mkDepends Filepath Srcfiles > /home/yy/clm3.5/bld/Depends
pgf90 -c -Mfree -I. -I/home/yy/clm3.5/src/csm_share/shr -I/home/yy/clm3.5/src/csm_share/eshr -I/home/yy/clm3.5/src/utils/timing -I/home/yy/clm3.5/src/utils/mct/mpeu -I/home/yy/clm3.5/src/utils/mct/mct -I/home/yy/clm3.5/src/utils/mct/mpi-serial -I/home/yy/clm3.5/src/utils/esmf_wrf_timemgr -I/home/yy/clm3.5/src/main -I/home/yy/clm3.5/src/biogeophys -I/home/yy/clm3.5/src/biogeochem -I/home/yy/clm3.5/src/riverroute -I/usr/local/include -I/usr/local/include -DFORTRANUNDERSCORE -DMAXPATCH_PFT=4 -DOFFLINE -DLINUX -i4 -Mdalign -Mextend -byteswapio -O1 /home/yy/clm3.5/src/csm_share/shr/shr_kind_mod.F90
make: pgf90: Command not found
make: *** [shr_kind_mod.o] Error 127

Does anybody help me what the problem is?