/usr/share/slsh/local-packages/gslfft.sl is in slang-gsl 0.7.0-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | require ("gslcore");
_gslcore_import_module ("gslfft", current_namespace());
define fft ()
{
variable args = __pop_args (_NARGS);
return _gsl_fft_complex (__push_args (__tmp(args)));
}
provide ("gslfft");
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