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By default, ENABLE_INTERNAL_KISSFFT is ON for all architectures.
It is immutable on non-Unix systems because 'FindKissFFT.cmake'
relies on 'pkg-config' tool not available in Windows and Android.
If Kodi built with internal kissfft, the corresponding CMake search
module sets kissfft's include directory to the copied location
created by 'core_add_subdirs_from_filelist' macro expanded from
'cmake/treedata/common/externals.txt'.
If Kodi built with system kissfft, the module detects the presence
of header files and solib by 'pkg-config' and disables building the
'xbmc/contrib/kissfft' directory.
Signed-off-by: Vasyl Gello <vasek.gello@gmail.com>
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