From www-apps/owncloud-5.0.15 ebuild: RDEPEND="|| ( >=dev-lang/php-5.4.9[curl?,filter,gd,hash,json,mysql?,pdo,postgres?,simplexml,sqlite?,xmlwriter,zip] sqlite? ( <dev-lang/php-5.4.9[curl?,filter,gd,hash,json,mysql?,pdo,postgres?,simplexml,sqlite3,xmlwriter,zip] ) !sqlite? ( <dev-lang/php-5.4.9[curl?,filter,gd,hash,json,mysql?,pdo,postgres?,simplexml,xmlwriter,zip] ) )" In the second line, there is dependency on <dev-lang/php-5.4.9[...,sqlite3,...] but no such php exists in the tree. All php versions have sqlite use flag, not sqlite3.
Indeed, it has been some time now since we had such a version in tree. Thanks for catching this old compatibility part, the RDEPEND line looks better now Fixed in current ebuilds in tree