Cargo Features

etrade has no features set by default.

[dependencies]
etrade = { version = "0.6.0", features = ["keychain"] }
keychain = byteorder, secret-service, security-framework, winapi

Features from optional dependencies

In crates that don't use the dep: syntax, optional dependencies automatically become Cargo features. These features may have been created by mistake, and this functionality may be removed in the future.

byteorder win keychain?
secret-service linux keychain?
security-framework mac keychain?
winapi win keychain?