Just copy ncbi-tools-20100808.ebuild over to ncbi-tools-20110713.ebuild name. Works for me on ~amd64. That is blast 2.2.25. However, blast 2.2.26 is not in the expected FTP directory expected by the ebuild, but here instead: ftp://ftp.ncbi.nlm.nih.gov/blast/executables/release/LATEST/
+*ncbi-tools-2.2.26 (22 May 2012) + + 22 May 2012; Justin Lecher <jlec@gentoo.org> +ncbi-tools-2.2.26.ebuild: + Version BUmp, #416251; restructured large parts of the ebuild; move to EAPI=4 +