aria2

USE flags

• adns - Add support for asynchronous DNS resolution
• bittorrent - Enable support for the bittorrent protocol.
• gnutls - Use net-libs/gnutls as TLS provider (preferred). Otherwise, dev-libs/openssl will be used as TLS provider. Both apply only with USE=ssl.
• jemalloc - Use dev-libs/jemalloc for memory management
• libuv - Use dev-libs/libuv backend.
• libxml2 - Use dev-libs/libxml2 for XML parsing (preferred) instead of dev-libs/expat.
• metalink - Enable support for metalink.
• nettle - Use dev-libs/nettle for message digests, plus dev-libs/gmp for bittorrent (if enabled). If this flag is disabled, dev-libs/libgcrypt is used instead. This flag is ignored if dev-libs/openssl is used.
• nls - Add Native Language Support (using gettext - GNU locale utilities)
• scripts - Install additional scripts which use aria2's xmlrpc functionality.
• sqlite - Add support for sqlite - embedded sql database
• ssh - Enable SFTP support.
• ssl - Add support for SSL/TLS connections (Secure Socket Layer / Transport Layer Security)
• tcmalloc - Use the dev-util/google-perftools libraries to replace the malloc() implementation with a possibly faster one
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
• xmlrpc - Support for xml-rpc library

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