Well, you also have to specify where to look for TurboActivate using the -L commandline switch. For example, here's the x86 makefile that will be included with TurboActivate 4.0:
CXXFLAGS = -Os -s -ffunction-sections -fdata-sections -DNDEBUG -m32 -L../../i386LDFLAGS = -Wl,--gc-sections -Wl,-rpath='$$ORIGIN'
example: example.o g++ $(CXXFLAGS) $(LDFLAGS) -o ../../i386/example.out example.o -lTurboActivate -lrt
example.o: g++ -c $(CXXFLAGS) $(LDFLAGS) Example.c -o example.o