c-blosc 1.5.3 has been released. portage currently has 1.3.5, seven releases behind. The c-blosc-1.3.2-shared-libs.patch will need re-work for 1.5.3.
*c-blosc-1.5.3 (02 Apr 2015) 02 Apr 2015; Justin Lecher <jlec@gentoo.org> +c-blosc-1.5.3.ebuild, +files/c-blosc-1.5.3-shared-libs.patch, c-blosc-1.3.2.ebuild, c-blosc-1.3.5.ebuild: Version BUmp, bug #544770; fix version string for lz4 dep to compatible version, bug #516432