cd /PATH-TO-FFTW3/lib/
grep -e fftw_alloc_complex *
Binary file libfftw3.a matches

This indicates that 'fftw_alloc_complex'' is part of the libfftw3.a library (i.e., -lfftw3).

I think two possible causes might be that the wrong fftw3 library is referenced or fftw3 library was not compiled in a compatible way.

Regarding wrong fftw3 library, you could try replacing

-lfftw3

with

/opt/apps/fftw3/lib/libfftw3.a

This would tell the linker to use this libfftw3.a instead of another libfftw3.a, should more than one exist on your system.

Regarding incompatible fftw3 library, you could try to recompile fftw3 with the same compilers used for Wien2k.

What fftw3 version are you using? It might also be that the include file has changed if you are using the latest fftw3 version (3.3.4) instead of 3.3.3, which results in a problem similar to that observed in Wien2k 12.1 [http://www.mail-archive.com/wien%40zeus.theochem.tuwien.ac.at/msg06147.html].

Hope that helps and good luck.

On 7/13/2014 11:00 PM, vijaykumar gudelli wrote:
Dear Wien2k users,

We are trying to install wien2k 13.1 in a CENTOS6 machine. We could able to install all the parameters without any error except lapw0_mpi. It was showing the following error.

fft_modules.o: In function `fftw_parallel_mp_prepare_parallel_ffts_':
fft_modules.F:(.text+0x43): undefined reference to `fftw_mpi_init'
fft_modules.F:(.text+0xbf): undefined reference to `fftw_mpi_local_size_3d_f03'
fft_modules.F:(.text+0xd0): undefined reference to `fftw_alloc_complex'
fft_modules.o: In function `fftw_parallel_mp_c3fft_':
fft_modules.F:(.text+0xc90): undefined reference to `fftw_mpi_execute_dft'
fft_modules.F:(.text+0x1647): undefined reference to `fftw_mpi_execute_dft' fft_modules.F:(.text+0x3578): undefined reference to `fftw_mpi_plan_dft_3d_f03' fft_modules.F:(.text+0x3f8e): undefined reference to `fftw_mpi_plan_dft_3d_f03'
make[1]: *** [lapw0_mpi] Error 1
make[1]: Leaving directory `/home/kull/wien2k/SRC_lapw0'
make: *** [para] Error 2


Here is my OPTIONS file:

current:FOPT:-FR -mp1 -w -prec_div -pc80 -pad -ip -DINTEL_VML -traceback -xAVX -O3 current:FPOPT:-FR -mp1 -w -prec_div -pc80 -pad -ip -DINTEL_VML -traceback -xAVX -O3
current:FFTW_OPT:-DFFTW3 -I/opt/apps/fftw3/include
current:FFTW_LIBS:-I/opt/apps/fftw3/include -L/opt/apps/fftw3/lib -lfftw3_mpi -lfftw3 current:LDFLAGS:$(FOPT) -L/opt/intel/Compiler/11.1/046/mkl/lib/em64t -pthread
current:DPARALLEL:'-DParallel'
current:R_LIBS:-lmkl_lapack -lmkl_intel_lp64 -lmkl_intel_thread -lmkl_core -openmp -lpthread -lguide current:RP_LIBS:-lmkl_scalapack_lp64 -lmkl_solver_lp64 -lmkl_blacs_lp64 -lmpi $(FFTW_LIBS) $(R_LIBS)
current:MPIRUN:/opt/apps/openmpi/intel/bin/mpirun -np _NP_ _EXEC_
current:MKL_TARGET_ARCH:intel64

Thanks in advance
--
-- _Regards_


V. K. GUDELLI
vkgude...@gmail.com <mailto:vkgude...@gmail.com>
INDIA
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