nbdkit

USE flags

• curl - Add support for client-side URL transfer library
• ext2 - Enable the ext2 filter via sys-fs/e2fsprogs.
• gnutls - Prefer net-libs/gnutls as SSL/TLS provider (ineffective with USE=-ssl)
• libguestfs - Enable the app-emulation/libguestfs plugin.
• libssh - Enable the SSH plugin via net-libs/libssh.
• libvirt - Enable the app-emulation/libvirt plugin.
• lzma - Support for LZMA (de)compression algorithm
• nbd - Enable the nbd plugin via sys-libs/libnbd.
• selinux - !!internal use only!! Security Enhanced Linux support, this must be set by the selinux profile or breakage will occur
• torrent - Enable the torrent plugin via net-libs/libtorrent-rasterbar.
• valgrind - Enable annotations for accuracy. May slow down runtime slightly. Safe to use even if not currently using dev-util/valgrind
• zlib - Add support for zlib (de)compression
• zstd - Enable support for ZSTD compression