Eigan Library on newest arduino due board, finding library?

i have arduino due , newest software , installed core it.
now putting eigan library in arduino library folder in home directory libraries , sketches library folder in library folder eigan folder , eigan zip , #include <eigan/dense>
is used trying hook in dense.c file includes other things.
i did once before stuck.
it great if simple installig , adding library added zip library manager , tried adding it.
if attach library arduino due ready zip add great.

quote

#include <eigan/dense>

you not include directories. need specify extension of file, if dense file name. typically not include .c files; include .h files.

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