fftw_r2r_kind = enum
  FFTW_R2HC = 0, FFTW_HC2R = 1, FFTW_DHT = 2, FFTW_REDFT00 = 3,
  FFTW_REDFT01 = 4, FFTW_REDFT10 = 5, FFTW_REDFT11 = 6, FFTW_RODFT00 = 7,
  FFTW_RODFT01 = 8, FFTW_RODFT10 = 9, FFTW_RODFT11 = 10

fftw_iodim {...}{.pure.} = object
  n*: cint
  `is`*: cint
  os*: cint

ptrdiff_t = clong

wchar_t = cint

fftw_iodim64 {...}{.pure.} = object
  n*: ptrdiff_t
  `is`*: ptrdiff_t
  os*: ptrdiff_t

fftw_write_char_func = proc (c: char; a3: pointer) {...}{.cdecl.}

fftw_read_char_func = proc (a2: pointer): cint {...}{.cdecl.}

fftw_plan = pointer

fftw_cc: cstring

fftw_codelet_optim: cstring

fftw_version: cstring

Fftw3Lib = "libfftw3.so"

proc fftw_fprint_plan(p: fftw_plan; output_file: ptr File) {...}{.cdecl,
    importc: "fftw_fprint_plan", dynlib: Fftw3Lib.}

proc fftw_print_plan(p: fftw_plan) {...}{.cdecl, importc: "fftw_print_plan",
                                     dynlib: Fftw3Lib.}

proc fftw_sprint_plan(p: fftw_plan): cstring {...}{.cdecl,
    importc: "fftw_sprint_plan", dynlib: Fftw3Lib.}

proc fftw_malloc(n: csize_t): pointer {...}{.cdecl, importc: "fftw_malloc",
                                        dynlib: Fftw3Lib.}

proc fftw_alloc_real(n: csize_t): ptr cdouble {...}{.cdecl,
    importc: "fftw_alloc_real", dynlib: Fftw3Lib.}

proc fftw_alloc_complex(n: csize_t): ptr fftw_complex {...}{.cdecl,
    importc: "fftw_alloc_complex", dynlib: Fftw3Lib.}

proc fftw_free(p: pointer) {...}{.cdecl, importc: "fftw_free", dynlib: Fftw3Lib.}

proc fftw_flops(p: fftw_plan; add: ptr cdouble; mul: ptr cdouble;
                fmas: ptr cdouble) {...}{.cdecl, importc: "fftw_flops",
                                     dynlib: Fftw3Lib.}

proc fftw_estimate_cost(p: fftw_plan): cdouble {...}{.cdecl,
    importc: "fftw_estimate_cost", dynlib: Fftw3Lib.}

proc fftw_cost(p: fftw_plan): cdouble {...}{.cdecl, importc: "fftw_cost",
                                        dynlib: Fftw3Lib.}

proc fftw_alignment_of(p: ptr cdouble): cint {...}{.cdecl,
    importc: "fftw_alignment_of", dynlib: Fftw3Lib.}