For those running into the same issue (I got it from using ic-repl), just make sure to update the Cargo.toml of the binary you’re trying to build like this:
-ic-agent = "0.9.0"
+ic-agent = { git = "https://github.com/dfinity/agent-rs" }
candid = { version = "0.7.8", features = ["random"] }
rustyline = "8.2"
rustyline-derive = "0.4"
ansi_term = "0.12"
pretty_assertions = "0.7"
terminal_size = "0.1"
codespan-reporting = "0.11"
pretty = "0.10.0"
pem = "0.8"
shellexpand = "2.1"
ic-agent = "0.9.0"
tokio = { version = "1.6.0", features = ["full"] }
garcon = "0.2.3"
anyhow = "1.0"
rand = "0.8"
logos = "0.12"
lalrpop-util = "0.19"
clap = "2.33"
structopt = "0.3.16"
ring = "0.16"
serde = "1.0"
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