Cargo Features

sixel-sys has no features set by default.

[dependencies]
sixel-sys = { version = "0.5.0", features = ["png", "python_interface"] }
png = libpng-sys

Need to handle these eventually

python_interface

Maybe I should just turn this off regardless
99% of the time it won't be needed

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.

libpng-sys png?