Compiled bitcoin-0.18.0.tar.gz from https://bitcoin.org/bin/bitcoin-core-0.18.0/ on Ubuntu 18.04.2 LTS (using [this](http://Bitkoins.nl/maken.txt) (simple) bash script). The compilation went well (had to add doxygen to suppress a warning message). When running the test: `test_bitcoin` in `bitcoin-0.18.0/src/test/`, I get the following error messages (multiple times):

`Error: Specified -walletdir "/tmp/test_bitcoin/1556861148_943311758/tempdir/path_does_not_exist" does not exist`

and

`Error: Specified -walletdir "/tmp/test_bitcoin/1556861730_643733972/tempdir/not_a_directory.dat" is not a directory`

and

`Error: Specified -walletdir "wallets" is a relative path`

Note that at the end it still says: `*** No errors detected`

#include <noui.h>
#include <ui_interface.h>
#include <util/system.h>
#include <cstdio>
#include <stdint.h>
#include <string>
#include <boost/signals2/connection.hpp>
bool noui_ThreadSafeMessageBox(const std::string& message, const std::string& caption, unsigned int style)