refactoring

CMakeLists.txt
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			project(fft)

			find_package(FFTW3 REQUIRED)

			set(SRCS
			fft_fftw.F90
			)

			if(NOT DEFINED FFT_EXAMPLES)
			option(FFT_EXAMPLES "Compiles the examples" ON)
			endif()

			add_library(fft ${SRCS})

			target_include_directories(fft
			PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
			${FFTW3_INCLUDE_DIRS}
			INTERFACE $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>
			$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
			${FFTW3_INCLUDE_DIRS}
			)

			target_compile_options(fft PRIVATE "-Dfft_w3")
			target_link_libraries(fft PUBLIC ${FFTW3_LIBRARIES} ${MPI_Fortran_LIBRARIES})

			set_property(TARGET fft
			PROPERTY PUBLIC_HEADER ${CMAKE_CURRENT_BINARY_DIR}/modules/fft.mod)

			if(FFT_EXAMPLES)
			set(EXAMPLES tfft.f90)
			add_executable(tfft tfft.f90)
			target_link_libraries(tfft fft ${MPI_Fortran_LIBRARIES})
			endif()

			install(TARGETS fft
			EXPORT ${BSPLINES_EXPORT_TARGETS}
			ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
			PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
			)