fix build

signer/Cargo.toml

@@ -33,7 +33,7 @@ std = [
 # https://github.com/rust-bitcoin/rust-bitcoin/issues/930#issuecomment-1215538699
 sr25519 = ["schnorrkel"]
 ecdsa = ["secp256k1"]
-unstable-eth = ["keccak-hash", "ecdsa", "secp256k1", "bip32"]
+unstable-eth = ["subxt", "keccak-hash", "ecdsa", "secp256k1", "bip32"]
 
 # Make the keypair algorithms here compatible with Subxt's Signer trait,
 # so that they can be used to sign transactions for compatible chains.
@@ -49,7 +49,9 @@ secrecy = { workspace = true }
 regex = { workspace = true, features = ["unicode"] }
 hex = { workspace = true, features = ["alloc"] }
 cfg-if = { workspace = true }
-codec = { package = "parity-scale-codec", workspace = true, features = ["derive"] }
+codec = { package = "parity-scale-codec", workspace = true, features = [
+    "derive",
+] }
 sp-crypto-hashing = { workspace = true }
 pbkdf2 = { workspace = true }
 sha2 = { workspace = true }
@@ -58,7 +60,10 @@ zeroize = { workspace = true }
 bip39 = { workspace = true }
 bip32 = { workspace = true, features = ["alloc", "secp256k1"], optional = true }
 schnorrkel = { workspace = true, optional = true }
-secp256k1 = { workspace = true, optional = true, features = ["alloc", "recovery"] }
+secp256k1 = { workspace = true, optional = true, features = [
+    "alloc",
+    "recovery",
+] }
 keccak-hash = { workspace = true, optional = true }
 
 # We only pull this in to enable the JS flag for schnorrkel to use.