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    # ***** BEGIN GPL LICENSE BLOCK *****
    #
    # This program is free software; you can redistribute it and/or
    # modify it under the terms of the GNU General Public License
    # as published by the Free Software Foundation; either version 2
    # of the License, or (at your option) any later version.
    #
    # This program is distributed in the hope that it will be useful,
    # but WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    # GNU General Public License for more details.
    #
    # You should have received a copy of the GNU General Public License
    # along with this program; if not, write to the Free Software Foundation,
    # Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
    #
    # ***** END GPL LICENSE BLOCK *****
    
    set(FFTW_EXTRA_ARGS)
    
    if(WIN32)
      set(FFTW3_ENV set CFLAGS=-fno-stack-check -fno-stack-protector -mno-stack-arg-probe -fno-lto &&)
      set(FFTW3_PATCH_COMMAND ${PATCH_CMD} --verbose -p 0 -N -d ${BUILD_DIR}/fftw3/src/external_fftw3 < ${PATCH_DIR}/fftw3.diff)
    endif()
    
    ExternalProject_Add(external_fftw3
      URL ${FFTW_URI}
      DOWNLOAD_DIR ${DOWNLOAD_DIR}
      URL_HASH MD5=${FFTW_HASH}
      PREFIX ${BUILD_DIR}/fftw3
      CONFIGURE_COMMAND ${CONFIGURE_ENV} && ${FFTW3_ENV} cd ${BUILD_DIR}/fftw3/src/external_fftw3/ && ${CONFIGURE_COMMAND} --enable-static --prefix=${mingw_LIBDIR}/fftw3
      PATCH_COMMAND ${FFTW3_PATCH_COMMAND}
      BUILD_COMMAND ${CONFIGURE_ENV} && cd ${BUILD_DIR}/fftw3/src/external_fftw3/ && make -j${MAKE_THREADS}
      INSTALL_COMMAND ${CONFIGURE_ENV} && cd ${BUILD_DIR}/fftw3/src/external_fftw3/ && make install
      INSTALL_DIR ${LIBDIR}/fftw3
    )
    
    if(MSVC)
      set_target_properties(external_fftw3 PROPERTIES FOLDER Mingw)
      if(BUILD_MODE STREQUAL Release)
        ExternalProject_Add_Step(external_fftw3 after_install
          COMMAND ${CMAKE_COMMAND} -E copy ${LIBDIR}/fftw3/lib/libfftw3.a ${HARVEST_TARGET}/fftw3/lib/libfftw.lib
          COMMAND ${CMAKE_COMMAND} -E copy ${LIBDIR}/fftw3/include/fftw3.h ${HARVEST_TARGET}/fftw3/include/fftw3.h
          DEPENDEES install
        )
      endif()
    endif()