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You can query which precisions are installed on your system using the
"precision" method, documented below.
 
As an Alien module, Alien::FFTW3 attempts to build fftw on your system
from source if it's not found at install time.  Because I'm Lazy, I
use the existing Alien::Base infrastructure from Joel Berger to
install in that case.  
 
Alien::Base isn't capable of installing the library in a place where
the default pkg-config will find it on all systems, so there is some
logic to place it in a best guess for where system libraries "should"
go on your system: we examine the path searched by pkg-config and 
place the fftw library in a suitable spot that can be located.
 
=head1 SEE ALSO
 
Alien::Base, PDL::FFTW3, http://fftw.org
 
=head1 METHODS
 
=cut