[Bdi4emc-help] Problems of compiling EMC on BDI 4.38

Hello everyone... I am new to Linux and EMC, and I am trying to compile EMC on a BDI 4.38 but failed. I have read the Mailing list archives and use the 3rd option from Paul -- that is use the EMC 1.0-39. During the process, I first run "sudo apt-get update", and then "./ configure" seems to be completed successfully. When I run "make", the error message is: " ... make -C /lib/modules/2.6.12.6-rtai/build SUBDIRS=/home/surix/emc-1.0/ src CC=gcc-2.95 V=0 modules make: *** /lib/modules/2.6.12.6-rtai/build: No such file or directory. Stop. make: *** [modules] Error 2 " What is the problem? Please help me... Meng Shen