Problem with tests

When we launch 'make check' we can see:

You are root
../src/orocos_core-rtai.o: unresolved symbol rtf_destroy
../src/orocos_core-rtai.o: unresolved symbol rtf_put
../src/orocos_core-rtai.o: unresolved symbol rtf_get
../src/orocos_core-rtai.o: unresolved symbol rtf_create_handler
../src/orocos_core-rtai.o: unresolved symbol rtf_create
../src/orocos_core-rtai.o: unresolved symbol rtf_resize
../src/orocos_core-rtai.o:
[...]
=====================
11 of 11 tests failed
=====================
make[2]: *** [check-TESTS] Error 1
make[2]: Leaving directory `/root/prova/orocos/core/build/tests'
make[1]: *** [check-am] Error 2
make[1]: Leaving directory `/root/prova/orocos/core/build/tests'
make: *** [check-recursive] Error 1

But if we do first 'modprobe orocos_core_run-rt' (we can do it because we have
run 'make install' anyway) the output is:

You are root
insmod: a module named orocos_core-rtai already exists
insmod: a module named orocos_core_run-rt already exists
FAIL: testload.sh
You are root
./test-rt.o: unresolved symbol asin
./test-rt.o:
rmmod: module test-rt is not loaded
FAIL: test-rt.sh
You are root
Warning: loading ./test_heartbeat-rt.o will taint the kernel: no license
  See http://www.tux.org/lkml/#s1-18 for information about tainted modules
Warning: loading ./test_heartbeat-rt.o will taint the kernel: forced load
Module test_heartbeat-rt loaded, with warnings
PASS: test_heartbeat-rt.sh
[...]
You are root
./TestCore-rt.o: unresolved symbol __ls__Q29StoneHead6streaml
./TestCore-rt.o:
rmmod: module TestCore-rt is not loaded
FAIL: TestCore-rt.sh
PASS: testunload.sh
====================
3 of 11 tests failed
====================
make[2]: *** [check-TESTS] Error 1
make[2]: Leaving directory `/root/prova/orocos/core/build/tests'
make[1]: *** [check-am] Error 2
make[1]: Leaving directory `/root/prova/orocos/core/build/tests'
make: *** [check-recursive] Error 1

Why? Where we are wrong? Does a test in real-time consists only in load and
unload modules in the kern
tput of 'lsmod' (before 'modprobe
orocos_core_run-rt'):

Module
rtai_fifos
rtai_pthread  
rtai_utils   
rtai_cpp  
rtai_sched_ext    
rtai_bits       
rtai_lxrt          
rtai_tbx        
rtai_sched       
rt_mem_mgr      
rtai 

Regards
Piercarlo
Fabrizio