net-fs/nfsutils-1.2.5 and up check for libgssglue being >= 0.3 (see nfs-utils-1.2.5/aclocal/rpcsec_vers.m4), but the dependency in the ebuild is just "net-libs/libgssglue" (unversioned). Please fix the dependency to avoid a build failure if libgssglue-0.1 is installed (current stable).
should be all set now in the tree; thanks for the report! Commit message: Require newer version of libgssglue http://sources.gentoo.org/net-fs/nfs-utils/nfs-utils-1.2.5.ebuild?r1=1.1&r2=1.2