Check the attached build log, a detailed description of the problem can be found on the blog post in URL.
Created attachment 167998 [details] Build log
fixed in cvs http://sources.gentoo.org/sys-auth/pam_bioapi/pam_bioapi-0.4.0.ebuild?r1=1.2&r2=1.3 http://sources.gentoo.org/sys-auth/pam_bioapi/files/pam_bioapi-0.4.0-headers.patch?rev=1.1