Build fails: "Undefined symbols for architecture x86_64"

I am trying to build MuseScore, but the build fails with this error:
Undefined symbols for architecture x86_64:
"qInitResources_mtest()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
"qInitResources_musescorefonts_Free()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
"qInitResources_musescorefonts_MScore()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
"qInitResources_musescorefonts_Bravura()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
"qInitResources_musescorefonts_MuseJazz()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
"qInitResources_musescorefonts_FreeSerif()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
"qInitResources_musescorefonts_Gootville()", referenced from:
initMyResources() in libtestutils.a(testutils.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


It seems to me that the error has to do with the file mtest/testutils.cpp. In that file, we see this code:

static void initMyResources()
{
    Q_INIT_RESOURCE(mtest);
    Q_INIT_RESOURCE(musescorefonts_MScore);
    Q_INIT_RESOURCE(musescorefonts_Gootville);
    Q_INIT_RESOURCE(musescorefonts_Bravura);
    Q_INIT_RESOURCE(musescorefonts_MuseJazz);
    Q_INIT_RESOURCE(musescorefonts_FreeSerif);
    Q_INIT_RESOURCE(musescorefonts_Free);
}

This is what I have done, trying to follow the compile instructions:

• fork and clone MuseScore from GitHub
• create build.debug directory in MuseScore directory
• in that directory cmake .. -GXcode -DCMAKE_BUILD_TYPE=Debug to configure
• and then cmake --build .

What I also find remarkable, is the discrepancy between the code here above (from test/testutils.cpp) and some code found in main/main.cpp:

static void initResources()
{
#ifdef Q_OS_MAC
    Q_INIT_RESOURCE(musescore);
    Q_INIT_RESOURCE(qml);
    Q_INIT_RESOURCE(musescorefonts_Mac);
    Q_INIT_RESOURCE(shortcut_Mac);
#else
    Q_INIT_RESOURCE(musescore);
    Q_INIT_RESOURCE(qml);
    Q_INIT_RESOURCE(musescorefonts_MScore);
    Q_INIT_RESOURCE(musescorefonts_Gootville);
    Q_INIT_RESOURCE(musescorefonts_Bravura);
    Q_INIT_RESOURCE(musescorefonts_MuseJazz);
    Q_INIT_RESOURCE(musescorefonts_Campania);
    Q_INIT_RESOURCE(musescorefonts_FreeSerif);
    Q_INIT_RESOURCE(musescorefonts_Free);
    Q_INIT_RESOURCE(shortcut);
#endif
}

• in main/main.cpp a differentiation is made for macOS, and for the other platforms seven font resources are initialized;
• but in test/testutils.cpp, no differentiation is made, and only six font resources are initialized.

When I change test/testutils.cpp according to main/main.cpp, the errors about the fonts go away, but the following line still causes an error:
Q_INIT_RESOURCE(mtest);

Version info: I am trying to build a clone of a fork of the master branch on macOS 10.15.6 with Xcode 11.6.