fortran - Compilation error: Undefined symbols for architecture x86_64 -

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i trying use fortran library perform fft called "2decomp&fft"(http://www.2decomp.org/download.html). library has in-built fft engine , works fine code. in order use fftw3 engine library, instead of in-built engine, instructions say:

edit 'src/makefile.inc' file in 2decomp, change fft engine 'fft=fftw3'. need set fftw_path variable in same file point fftw installation. recompile everything.

i installed fftw3.3 on local mac , followed instructions , recompiled library. after when trying compile code library, getting following error while linking. 

undefined symbols architecture x86_64: "_dfftw_destroy_plan_", referenced from:   ___decomp_2d_fft_mod_decomp_2d_fft_finalize in lib2decomp_fft.a(fft_fftw3.o) "_dfftw_execute_dft_", referenced from:   ___decomp_2d_fft_mod_c2c_1m_z in lib2decomp_fft.a(fft_fftw3.o)   ___decomp_2d_fft_mod_c2c_1m_x in lib2decomp_fft.a(fft_fftw3.o)   ___decomp_2d_fft_mod_c2c_1m_y in lib2decomp_fft.a(fft_fftw3.o) "_dfftw_execute_dft_c2r_", referenced from:   ___decomp_2d_fft_mod_c2r_1m_x in lib2decomp_fft.a(fft_fftw3.o)   ___decomp_2d_fft_mod_fft_3d_c2r in lib2decomp_fft.a(fft_fftw3.o) "_dfftw_execute_dft_r2c_", referenced from:   ___decomp_2d_fft_mod_fft_3d_r2c in lib2decomp_fft.a(fft_fftw3.o) "_dfftw_plan_many_dft_", referenced from:   ___decomp_2d_fft_mod_c2c_1m_z_plan in lib2decomp_fft.a(fft_fftw3.o)   ___decomp_2d_fft_mod_c2c_1m_x_plan in lib2decomp_fft.a(fft_fftw3.o)   ___decomp_2d_fft_mod_c2c_1m_y_plan in lib2decomp_fft.a(fft_fftw3.o) "_dfftw_plan_many_dft_c2r_", referenced from:   ___decomp_2d_fft_mod_init_fft_engine in lib2decomp_fft.a(fft_fftw3.o) "_dfftw_plan_many_dft_r2c_", referenced from:   ___decomp_2d_fft_mod_init_fft_engine in lib2decomp_fft.a(fft_fftw3.o) ld: symbol(s) not found architecture x86_64 collect2: error: ld returned 1 exit status make: *** [sora_v71] error 1

here minimal code have written calls library: program test

  use decomp_2d   use decomp_2d_fft    integer n, pr, pc    call decomp_2d_init(n,n,n,pr,pc)   call decomp_2d_fft_init    stop   end

here makefile using (decomp2d environment variable set folder containing library) :

## ------------------------------------------------------------------------ # lines included using 2decomp libraries  inc_2decomp = -i$(decomp2d)/include/ lib_2decomp = -l$(decomp2d)/lib/ -l2decomp_fft  ## ------------------------------------------------------------------------  rm           =  rm srcdir       = . libdir       = .  bin          = a.out objs         = main.o   ## ------------------------------------------------------------------------  # default command compiler, linker fc       =  mpif90  fflags   = $(f90flag) $(inc_2decomp) lflags   = $(f90flag) $(lib_2decomp) -l$(libdir)  ## ------------------------------------------------------------------------  # default action all: $(bin)  $(bin): $(objs) @echo linking $(bin) ..... $(fc) $(objs)  $(lflags) $(fflags) -o $@   .f.o: @echo compiling $*.f $(fc)  $(lflags) $(fflags) -c $(srcdir)/$*.f  clean: @echo 'cleaning .....' $(rm) -f core *.o *~ *.l *.o $(bin) $(size_file)


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