When I try to synchronize my computers with syncevo-http-server (which starts
syncevo-dbus-server), it fails with "Akonadi is not running. It can be started
with 'akonadictl start'."

Akonadi however is running and "syncevolution --print-databases" finds the
akonadi collections.

The following simple test program prints "Running":

#include <Akonadi/ServerManager>
#include <iostream>

int main()
{
        if (Akonadi::ServerManager::isRunning())
                std::cout << "Running" << std::endl;
        else
                std::cout << "Not running" << std::endl;
        return 0;
}