@jonasschnelli wrote in #14979:
> #14573 broke < Qt5.6 compatibility due to calling the lambda version of `addAction` that was added in Qt5.6.

We currently [support](https://github.com/bitcoin/bitcoin/blob/master/doc/dependencies.md) QT >=5.2, but hardly anyone tests with that. If we make one of the Travis machines use it, we should have a better change of catching this.

See also discussion about minimum QT version in #13478 
{
    std::shared_ptr<CWallet> const wallet = GetWalletForJSONRPCRequest(request);
    CWallet* const pwallet = wallet.get();
    if (!EnsureWalletIsAvailable(pwallet, request.fHelp)) {
        return NullUniValue;
    }
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 3)
        throw std::runtime_error(
            RPCHelpMan{"importprivkey",
                "\nAdds a private key (as returned by dumpprivkey) to your wallet. Requires a new wallet backup.\n"
                "Hint: use importmulti to import more than one private key.\n"
            "\nNote: This call can take over an hour to complete if rescan is true, during that time, other rpc calls\n"
            "may report that the imported key exists but related transactions are still missing, leading to temporarily incorrect/bogus balances and unspent outputs until rescan completes.\n",
                {
                    {"privkey", RPCArg::Type::STR,  false,  "", "The private key (see dumpprivkey)"},
                    {"label", RPCArg::Type::STR,  true,  "current label if address exists, otherwise \"\"", "An optional label"},
                    {"rescan", RPCArg::Type::BOOL,  true,  "true", "Rescan the wallet for transactions"},
                },
                RPCResults{},
                RPCExamples{
            "\nDump a private key\n"
            + HelpExampleCli("dumpprivkey", "\"myaddress\"") +
            "\nImport the private key with rescan\n"
            + HelpExampleCli("importprivkey", "\"mykey\"") +