You need the following external libraries to compile the plugin:
libmtsupport
libbtree
libfacet
libmtquery
FILE=libmtsupport-0.0.1alpha2
wget http://youonlylivetwice.info/multitran/$FILE.7z && 7z x $FILE.7z && cd $FILE && make && sudo make install
FILE=libbtree-0.0.1alpha2
wget http://youonlylivetwice.info/multitran/$FILE.7z && 7z x $FILE.7z && cd $FILE && make && sudo make install
FILE=libfacet-0.0.1alpha2
wget http://youonlylivetwice.info/multitran/$FILE.7z && 7z x $FILE.7z && cd $FILE && make && sudo make install
FILE=libmtquery-0.0.1alpha3-shaforostoff
wget http://youonlylivetwice.info/multitran/$FILE.7z && 7z x $FILE.7z && cd $FILE && make && sudo make install
Then put this dir into qstardict/plugins and run qmake && make && sudo make install
Download multitran-data.tar.bz2 from multitran.sf.net
tar xjf multitran-data.tar.bz2 && cd multitran-data && make && sudo make install
See multitran.sf.net and multitran.ru for details