if ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux")

  # Default to older SSE-instruction-based FFT library
  if (LEGACY_ARCHITECTURE OR (NOT DEFINED(LEGACY_ARCHITECTURE)))
     set(fft_library ${CMAKE_CURRENT_SOURCE_DIR}/libfft_sse.a )
  else()
    message(WARNING "Attempting to use libfft_avx.a, which only works on recent x86 architectures.")
    set(fft_library ${CMAKE_CURRENT_SOURCE_DIR}/libfft_avx.a )
  endif()
  add_executable( coarray_navier_stokes
    coarray-shear_coll.F90
    ${walltime_o}
  )
  target_link_libraries(coarray_navier_stokes OpenCoarrays ${fft_library})
else()
  # Skip Navier-Stokes build until an appropriate FFT has been found.
endif()
