Version 7.8.3 is available upstream. Please consider updating! It seems that version 7.8.3 is available upstream, while the latest version in the Gentoo tree is 7.0.0. You think this warning is false? Read more about it here.
suitesparseconfig-7.0.0 fails to build with multilib enabled because of dependencies that cannot be satisfied. All the other packages require it. Bug #908851.
SuiteSparse_config is a set of configuration files for the SuiteSparse matrix libraries
from CISE at University of Florida. It contains some headers and makefiles.