gui: Building with --disable-bip70 fails on current master on gentoo #16600

Building with:

$ ./autogen.sh
$ ./configure --disable-bip70
$ make

Got error:

  CXX      qt/libbitcoinqt_a-moc_paymentserver.o
qt/moc_paymentserver.cpp: In static member function ‘static void PaymentServer::qt_static_metacall(QObject*, QMetaObject::Call, int, void**)’:
qt/moc_paymentserver.cpp:123:21: error: ‘class PaymentServer’ has no member named ‘receivedPaymentACK’; did you mean ‘receivedPaymentRequest’?
         case 2: _t->receivedPaymentACK((*reinterpret_cast< const QString(*)>(_a[1]))); break;
                     ^~~~~~~~~~~~~~~~~~
                     receivedPaymentRequest
qt/moc_paymentserver.cpp:126:21: error: ‘class PaymentServer’ has no member named ‘fetchPaymentACK’
         case 5: _t->fetchPaymentACK((*reinterpret_cast< WalletModel*(*)>(_a[1])),(*reinterpret_cast< const SendCoinsRecipient(*)>(_a[2])),(*reinterpret_cast< QByteArray(*)>(_a[3]))); break;
                     ^~~~~~~~~~~~~~~
qt/moc_paymentserver.cpp:128:21: error: ‘class PaymentServer’ has no member named ‘netRequestFinished’
         case 7: _t->netRequestFinished((*reinterpret_cast< QNetworkReply*(*)>(_a[1]))); break;
                     ^~~~~~~~~~~~~~~~~~
qt/moc_paymentserver.cpp:129:21: error: ‘class PaymentServer’ has no member named ‘reportSslErrors’
         case 8: _t->reportSslErrors((*reinterpret_cast< QNetworkReply*(*)>(_a[1])),(*reinterpret_cast< const QList<QSslError>(*)>(_a[2]))); break;
                     ^~~~~~~~~~~~~~~
qt/moc_paymentserver.cpp:130:21: error: ‘class PaymentServer’ has no member named ‘handlePaymentACK’
         case 9: _t->handlePaymentACK((*reinterpret_cast< const QString(*)>(_a[1]))); break;
                     ^~~~~~~~~~~~~~~~
qt/moc_paymentserver.cpp:162:83: error: ‘receivedPaymentACK’ is not a member of ‘PaymentServer’
             if (*reinterpret_cast<_t *>(_a[1]) == static_cast<_t>(&PaymentServer::receivedPaymentACK)) {
                                                                                   ^~~~~~~~~~~~~~~~~~
qt/moc_paymentserver.cpp: At global scope:
qt/moc_paymentserver.cpp:221:6: error: no declaration matches ‘void PaymentServer::receivedPaymentACK(const QString&)’
 void PaymentServer::receivedPaymentACK(const QString & _t1)
      ^~~~~~~~~~~~~
qt/moc_paymentserver.cpp:221:6: note: no functions named ‘void PaymentServer::receivedPaymentACK(const QString&)’
In file included from qt/moc_paymentserver.cpp:8:
./qt/paymentserver.h:62:7: note: ‘class PaymentServer’ defined here
 class PaymentServer : public QObject
       ^~~~~~~~~~~~~

Which os?

Gentoo Linux, GCC 8.2.0

My fault, I had built without --disable-bip70 in the same directory before and didn't run make clean.

This error also happens when switching between pull requests based on master before and after #15584. I should probably just keep using --disable-bip70 for a while.