Fix error of CMakeLists empty

CMakeLists.txt

 cmake_minimum_required(VERSION 2.6)
 
-subdirs(f_fftw)
\ No newline at end of file
+subdirs(f_fftw)

f_fftw/CMakeLists.txt

 cmake_minimum_required(VERSION 2.6)
+project(f_fftw)
+
+
+find_path(FFTW_INCLUDE_DIR fftw3.h)
+find_library(FFTW_LIBRARIES NAMES fftw3f)
+
+find_package(blc_channel REQUIRED)
+find_package(blc_program REQUIRED)
+
+add_definitions(${BL_DEFINITIONS})
+include_directories(${BL_INCLUDE_DIRS} ${FFTW_INCLUDE_DIR})
+add_executable(f_fftw f_fftw.cpp)
+target_link_libraries(f_fftw ${BL_LIBRARIES} ${FFTW_LIBRARIES})
 
-subdirs(f_fftw)
\ No newline at end of file