Cargo Features

openssl2-sys has no features set by default.

[dependencies]
openssl2-sys = { version = "1.0.0", features = ["aes_xts", "sslv2", "tlsv1_1", "tlsv1_2"] }
aes_xts
sslv2
tlsv1_1
tlsv1_2

openssl2-sys has 4 features without comments.