Dears CNCZone:
Sorry I double post my question, but I think I posted in the wrong place, so I opened a new thread because I realized it was marked as answered.
I've just installed Slackware 2.6.10 with RTAI 3.3 and kernel patch 2.6.10-r12.
After an infinite number of trials I succeeded on make the realtime tests work.
I installed also the X11 environment with a lot of problems with the mouse, the video card, the recorder and so on, that are solved now!!!
I've also suceeded on compiling the emc2 without errors and have learned that the order of "insmoding" the modules is very important, because if there are no defined symbols the initialization will abort.

On that net of troubles I found the folowing:
There is an undefined symbol "ceil" that appears on the start of emc.
If I invert the options and the target in the "make" sentence I should solve the problem.
But I can't insert that in an infinite and recursive configure file!!!

The question is: Are there any recommended parameters I should give in the ./configure (--xxxxx_xxxx_xxx) to avoid this?

Yours:

Eng. Alejandro L. de la Barra.