Tried to install amarok and amarok-devel via macports.
Failed, so I tried to compile the 2.7.0 src.
this is what I get from make:

[ 26%] Building CXX object src/CMakeFiles/amaroklib.dir/core-impl/collections/support/MemoryMeta.o
In file included from /opt/local/src/amarok-2.7.0/src/core-impl/collections/support/MemoryMeta.cpp:18:
/opt/local/src/amarok-2.7.0/src/core-impl/collections/support/MemoryMeta.h:66:47: error: expected a class or namespace
        virtual QString name() const { return Base::name(); }
                                              ^
/opt/local/src/amarok-2.7.0/src/core-impl/collections/support/MemoryMeta.h:66:47: error: member 'Base' found in multiple base classes of different types
        virtual QString name() const { return Base::name(); }
                                              ^
/opt/local/src/amarok-2.7.0/src/core/meta/Meta.h:127:30: note: member found by ambiguous name lookup
    class AMAROK_CORE_EXPORT Base : public virtual QSharedData, public MetaCapability
                             ^
/opt/local/src/amarok-2.7.0/src/core-impl/collections/support/MemoryMeta.h:37:7: note: member found by ambiguous name lookup
class Base
      ^

Reproducible: Always

Steps to Reproduce:
1.  cmake -DCMAKE_INSTALL_PREFIX=/opt/kde4 -DCMAKE_BUILD_TYPE=debugfull ..
2. make
3.
Actual Results:  
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make[2]: *** [src/CMakeFiles/amaroklib.dir/core-impl/collections/support/MemoryMeta.o] Error 1
make[1]: *** [src/CMakeFiles/amaroklib.dir/all] Error 2
make: *** [all] Error 2

Expected Results:  
compiled without errors