Add software

Software/portapack-mayhem/hackrf/host/cmake/modules/FindFFTW.cmake

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+# - Find FFTW
+# Find the native FFTW includes and library
+#
+#  FFTW_INCLUDES    - where to find fftw3.h
+#  FFTW_LIBRARIES   - List of libraries when using FFTW.
+#  FFTW_FOUND       - True if FFTW found.
+
+if (FFTW_INCLUDES)
+  # Already in cache, be silent
+  set (FFTW_FIND_QUIETLY TRUE)
+endif (FFTW_INCLUDES)
+
+find_path (FFTW_INCLUDES fftw3.h)
+
+IF (WIN32)
+include_directories(${FFTW_INCLUDES})
+find_library (FFTW_LIBRARIES NAMES ${FFTW_LIBRARIES})
+ELSE(WIN32)
+find_library (FFTW_LIBRARIES NAMES fftw3f)
+ENDIF(WIN32)
+
+
+
+
+# handle the QUIETLY and REQUIRED arguments and set FFTW_FOUND to TRUE if
+# all listed variables are TRUE
+include (FindPackageHandleStandardArgs)
+find_package_handle_standard_args (FFTW DEFAULT_MSG FFTW_LIBRARIES FFTW_INCLUDES)
+
+mark_as_advanced (FFTW_LIBRARIES FFTW_INCLUDES)