Comment # 4 on bug 1177017 from Jan Engelhardt

Define not startable. Do you mean this error, or some other one?

# /usr/libexec/iwd/iwd
RC4 support not found
The following options are missing in the kernel:
        CONFIG_CRYPTO_USER_API_SKCIPHER
        CONFIG_CRYPTO_ECB
        CONFIG_CRYPTO_ARC4
# echo $?
1